BRITISH STANDARD BS 3643-2:1981(Reprinted, incorporating Amendment No. 1)

ISO metric screw threads —

Part 2: Specification for selected limits of size

UDC 621.882.082.1:621.753.1/.2

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS 3643-2:1981

This British Standard, having been prepared under the direction of the Mechanical Engineering Standards Committee, was published under the authority of the Executive Board and comes into effect on 31 December 1981

© BSI 12-1998

First published June 1965First revision December 1966Second revision December 1981

ISBN 0 580 12412 6

Cooperating organizations

The Mechanical Engineering Standards Committee, under whose direction this British Standard was prepared, consist of representatives from the following:

The Organization marked with an asterisk in the above list, together with the following, were directly represented on this Technical Committee entrusted with the presentation of this British Standard:

Associated Offices Technical Committee Department of Trade (Marine Division)Association of Consulting Engineers Department of TransportAssociation of Hydraulic Equipment Electricity supply Industry in England and

Manufacturers WalesAssociation of Mining Electrical and Engineering Equipment Users’ Association

Mechanical Engineers Federation of Manufacturers of ConstructionBritish Compressed Air Society Equipment and CranesBritish Electrical and Allied Manufacturers’ Health and Safety Executive

Association (BEAMA)* Institution of Gas Engineers

British Gas Corporation Institution of Plant EngineersBritish Gear Manufacturer’ Association Institution of Production Engineers

British Internal Combustion Engine Lloyd’s Register of ShippingManufacturers’ Association* London Transport Executive

British Pump Manufacturers’ Association Machine Tool Industry Research AssociationBritish Steel corporation Ministry of Defence*

British Steel Industry National Coal Board*British Valve Manufactures’ Association Ltd. Oil Companies Materials AssociationCbmpe Process Plant AssociationChartered Institution of Building Services Railway Industry Association of Great Britain*Crown Agents for Oversea Governments and Society of Motor Manufacturers and Traders

Administrations LimitedDepartment of the Environment (PSA) Telecommunication Engineering andDepartment of Industry (National Engineering Manufacturing Association (TEMA)*

Laboratory)

Agricultural Engineers’ Association Gauge and Tool Makers’ AssociationBicycle Association of Great Britain Screw Thread Tool Manufacturers’ AssociationBritish Industrial Fasteners Federation Society of British Aerospace CompaniesBritish Railways Board LimitedBusiness Equipment Trade Association Individual manufacturer

Fasteners and Turned Parts Institute

Amendments issued since publication

Amd. No Date of issue Comments

5094 June 1986 Indicated by a sideline in the margin

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BS 3643-2:1981

© BSI 12-1998 i

Contents

PageCooperating organizations Inside front coverForeword ii

1 Scope 12 References 13 Designation 1

Appendix A Additional tolerance classes for aerospace use 38

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement 2Table 2 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement for aerospace use 39

Publications referred to Inside back cover

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS 3643-2:1981

ii © BSI 12-1998

Foreword

This British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee. It supersedes BS 3643-2:1966 and BS 3643-3:1967, which are therefore withdrawn.BS 3643-1 contains details of the basic thread profile, general plan of standard diameter/pitch combinations, basic thread dimensions, tolerance principles and basic data from the latest ISO metric screw thread standards.The previous edition of BS 3643-2 specified the limits and tolerances for coarse pitch series threads in the range 1 mm to 68 mm diameter. The previous edition of BS 3643-3 specified the limits and tolerances for fine (constant) pitch threads in the range 1 mm to 300 mm diameter.In both Parts 2 and 3, three classes of fit were given, “close”, “medium” and “free”, the respective nut/bolt tolerance classes being 5H/4h, 6H/6g and 7H/8g. The same tolerance classes have been used as the basis for this standard but in addition the tolerance class 4H is specified for pitches up to and including 0.45 mm to align with Part 1. The selection of nut/bolt tolerance classes rests with the designer, based on the information given in Part 1.This edition of Part 2 combines the information previously given in both Parts 2 and 3, and is set out in a single table so as to present designers and users with the limits and tolerances for ISO metric threads in the most convenient form.For further detailed information see BS 3643-1.Pending the publication of a British Standard on coated threads, which will be based on ISO/DIS 4042, BS 3382 should be consulted for guidance.A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 40, an inside back cover and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS 3643-2:1981

© BSI 12-1998 1

1 ScopeThis Part of this British Standard specifies the fundamental deviations, tolerances and limits of size for the tolerance classes 4H, 5H, 6H and 7H for internal threads (nuts) and 4h, 6g and 8g for external threads (bolts) where appropriate for:

coarse pitch series within the range 1 mm to 68 mm diameter;fine pitch series within the range 1 mm to 33 mm diameter;constant pitch series within the range 8 mm to 300 mm diameter.

For certain diameter/pitch combinations tolerance class 4H for internal threads and tolerance classes 6h and 4g for external threads have been included in appendix A primarily for aerospace use.NOTE Attention is drawn to the fact that, with the different screw thread forms available, there is the possibility of mismatch. It is the responsibility of the designer of the end product to ensure that this possibility is reduced to a minimum. For further information see PD 6494.

2 ReferencesThe titles of the standards publications referred to in this standard are listed on the inside back cover.

3 DesignationThe complete designation for a screw thread shall comprise a designation for the thread system and a designation for the thread tolerance class (see 4.3 and 6.4 of BS 3643-1:1981).Examples:

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

2©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

NOTE For the minor diameter of external threads this table specifies the minimum dimensions only. The maximum dimensions have not been specified based on the requirement of 6.10 of BS 3643-1:1981 that these dimensions are controlled by the GO gauge.

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

1 0.2 4h6g

00.017

1.0000.983

0.0360.056

0.9640.927

0.8700.853

0.0300.048

0.8400.805

0.7170.682

4H 0 1.000 0.910 0.040 0.870 0.821 0.038 0.783

0.25 4h6g

00.018

1.0000.982

0.0420.067

0.9580.915

0.8380.820

0.0340.053

0.8040.767

0.6490.613

4H5H

00

1.0001.000

0.8830.894

0.0450.056

0.8380.838

0.7740.785

0.0450.056

0.7290.729

1.1

0.2 4h6g

00.017

1.1001.083

0.0360.056

1.0641.027

0.9700.953

0.0300.048

0.9400.905

0.8170.782

4H 0 1.100 1.010 0.040 0.970 0.921 0.038 0.883

0.25 4h6g

00.018

1.1001.082

0.0420.067

1.0581.015

0.9380.920

0.0340.053

0.9040.867

0.7500.713

4H5H

00

1.1001.100

0.9830.994

0.0450.056

0.9380.938

0.8740.885

0.0450.056

0.8290.829

1.2

0.2 4h6g

00.017

1.2001.183

0.0360.056

1.1641.127

1.0701.053

0.0300.048

1.0401.005

0.9170.882

4H 0 1.200 1.110 0.040 1.070 1.021 0.038 0.983

0.25 4h6g

00.018

1.2001.182

0.0420.067

1.1581.115

1.0381.020

0.0340.053

1.0040.967

0.8500.813

4H5H

00

1.2001.200

1.0831.094

0.0450.056

1.0381.038

0.9740.985

0.0450.056

0.9290.929

1.4

0.2 4h6g

00.017

1.4001.383

0.0360.056

1.3641.327

1.2701.253

0.0300.048

1.2401.205

1.1171.082

4H 0 1.400 1.310 0.040 1.270 1.221 0.038 1.183

0.34h6g

00.018

1.4001.382

0.0480.075

1.3521.307

1.2051.187

0.0360.056

1.1691.131

0.9840.946

4H5H6H

000

1.4001.4001.400

1.2531.2651.280

0.0480.0600.075

1.2051.2051.205

1.1281.1421.160

0.0530.0670.085

1.0751.0751.075

1.6

0.2 4h6g

00.017

1.6001.583

0.0360.056

1.5641.527

1.4701.453

0.0320.050

1.4381.403

1.3151.280

4H 0 1.600 1.512 0.042 1.470 1.421 0.038 1.383

0.35 4h6g

00.019

1.6001.581

0.0530.085

1.5471.496

1.3731.354

0.0400.063

1.3331.291

1.1171.075

4H5H6H

000

1.6001.6001.600

1.4261.4401.458

0.0530.0670.085

1.3731.3731.373

1.2841.3011.321

0.0630.0800.100

1.2211.2211.221

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

3

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

1.8

0.2 4h6g

00.017

1.8001.783

0.0360.056

1.7641.727

1.6701.653

0.0320.050

1.6381.603

1.5151.480

4H 0 1.800 1.712 0.042 1.670 1.621 0.038 1.583

0.354h6g

00.019

1.8001.781

0.0530.085

1.7471.696

1.5731.554

0.0400.063

1.5331.491

1.3171.275

4H5H6H

000

1.8001.8001.800

1.6261.6401.658

0.0530.0670.085

1.5731.5731.573

1.4841.5011.521

0.0630.0800.100

1.4211.4211.421

2

0.25 4h6g

00.018

2.0001.982

0.0420.067

1.9581.915

1.8381.820

0.0360.056

1.8021.764

1.6481.610

4H5H

00

2.0002.000

1.8861.898

0.0480.060

1.8381.838

1.7741.785

0.0450.056

1.7291.729

0.44h6g

00.019

2.0001.981

0.0600.095

1.9401.886

1.7401.721

0.0420.067

1.6981.654

1.4521.408

4H5H6H

000

2.0002.0002.000

1.7961.8111.830

0.0560.0710.090

1.7401.7401.740

1.6381.6571.679

0.0710.0900.112

1.5671.5671.567

2.2

0.25 4h6g

00.018

2.2002.182

0.0420.067

2.1582.115

2.0382.020

0.0360.056

2.0021.964

1.8481.810

4H5H

00

2.2002.200

2.0862.098

0.0480.060

2.0382.038

1.9741.985

0.0450.056

1.9291.929

0.454h6g

00.020

2.2002.180

0.0630.100

2.1372.080

1.9081.888

0.0450.071

1.8631.817

1.5851.539

4H5H6H

000

2.2002.2002.200

1.9681.9832.003

0.0600.0750.095

1.9081.9081.908

1.7931.8131.838

0.0800.1000.125

1.7131.7131.713

2.5

0.354h6g

00.019

2.5002.481

0.0530.085

2.4472.396

2.2732.254

0.0400.063

2.2332.191

2.0171.975

4H5H6H

000

2.5002.5002.500

2.3262.3402.358

0.0530.0670.085

2.2732.2732.273

2.1842.2012.221

0.0630.0800.100

2.1212.1212.121

0.454h6g

00.020

2.5002.480

0.0630.100

2.4372.380

2.2082.188

0.0450.071

2.1632.117

1.8851.839

4H5H6H

000

2.5002.5002.500

2.2682.2832.303

0.0600.0750.095

2.2082.2082.208

2.0932.1132.138

0.0800.1000.125

2.0132.0132.013

3

0.35 4h6g

00.019

3.0002.981

0.0530.085

2.9472.896

2.7732.754

0.0420.067

2.7312.687

2.5152.471

4H5H6H

000

3.0003.0003.000

2.8292.8442.863

0.0560.0710.090

2.7732.7732.773

2.6842.7012.721

0.0630.0800.100

2.6212.6212.621

0.54h6g

00.020

3.0002.980

0.0670.106

2.9332.874

2.6752.655

0.0480.075

2.6272.580

2.3192.272

5H6H7H

000

3.0003.0003.000

2.7552.7752.800

0.0800.1000.125

2.6752.6752.675

2.5712.5992.639

0.1120.1400.180

2.4592.4592.459

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

4©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

3.5

0.354h6g

00.019

3.5003.481

0.0530.085

3.4473.396

3.2733.254

0.0420.067

3.2313.187

3.0152.971

4H5H6H

000

3.5003.5003.500

3.3293.3443.363

0.0560.0710.090

3.2733.2733.273

3.1843.2013.221

0.0630.0800.100

3.1213.1213.121

0.64h6g

00.021

3.5003.479

0.0800.125

3.4203.354

3.1103.089

0.0530.085

3.0573.004

2.6882.635

5H6H7H

000

3.5003.5003.500

3.2003.2223.250

0.0900.1120.140

3.1103.1103.110

2.9753.0103.050

0.1250.1600.200

2.8502.8502.850

4

0.54h6g

00.020

4.0003.980

0.0670.106

3.9333.874

3.6753.655

0.0480.075

3.6273.580

3.3193.272

5H6H7H

000

4.0004.0004.000

3.7553.7753.800

0.0800.1000.125

3.6753.6753.675

3.5713.5993.639

0.1120.1400.180

3.4593.4593.459

0.74h6g

00.022

4.0003.978

0.0900.140

3.9103.838

3.5453.523

0.0560.090

3.4893.433

3.0583.002

5H6H7H

000

4.0004.0004.000

3.6403.6633.695

0.0950.1180.150

3.5453.5453.545

3.3823.4223.466

0.1400.1800.224

3.2423.2423.242

4.5

0.54h6g

00.020

4.5004.480

0.0670.106

4.4334.374

4.1754.155

0.0480.075

4.1274.080

3.8193.772

5H6H7H

000

4.5004.5004.500

4.2554.2754.300

0.0800.1000.125

4.1754.1754.175

4.0714.0994.139

0.1120.1400.180

3.9593.9593.959

0.754h6g

00.022

4.5004.478

0.0900.140

4.4104.338

4.0133.991

0.0560.090

3.9573.901

3.4953.439

5H6H7H

000

4.5004.5004.500

4.1084.1314.163

0.0950.1180.150

4.0134.0134.013

3.8383.8783.924

0.1500.1900.236

3.6883.6883.688

5

0.54h6g

00.020

5.0004.980

0.0670.106

4.9334.874

4.6754.655

0.0480.075

4.6274.580

4.3194.272

5H6H7H

000

5.0005.0005.000

4.7554.7754.800

0.0800.1000.125

4.6754.6754.675

4.5714.5994.639

0.1120.1400.180

4.4594.4594.459

0.84h6g

00.024

5.0004.976

0.0950.150

4.9054.826

4.4804.456

0.0600.095

4.4204.361

3.9273.868

5H6H7H

000

5.0005.0005.000

4.5804.6054.640

0.1000.1250.160

4.4804.4804.480

4.2944.3344.384

0.1600.2000.250

4.1344.1344.134

5.50.5

4h6g

00.020

5.5005.480

0.0670.106

5.4335.374

5.1755.155

0.0480.075

5.1275.080

4.8194.772

5H6H7H

000

5.5005.5005.500

5.2555.2755.300

0.0800.1000.125

5.1755.1755.175

5.0715.0995.139

0.1120.1400.180

4.9594.9594.959

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

5

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

6

0.754h6g

00.022

6.0005.978

0.0900.140

5.9105.838

5.5135.491

0.0630.100

5.4505.391

4.9884.929

5H6H7H

000

6.0006.0006.000

5.6195.6455.683

0.1060.1320.170

5.5135.5135.513

5.3385.3785.424

0.1500.1900.236

5.1885.1885.188

1 4h6g8g

00.0260.026

6.0005.9745.974

0.1120.1800.280

5.8885.7945.694

5.3505.3245.324

0.0710.1120.180

5.2795.2125.144

4.6634.5974.528

5H6H7H

000

6.0006.0006.000

5.4685.5005.540

0.1180.1500.190

5.3505.3505.350

5.1075.1535.217

0.1900.2360.300

4.9174.9174.917

7

0.754h6g

00.022

7.0006.978

0.0900.140

6.9106.838

6.5136.491

0.0630.100

6.4506.391

5.9885.929

5H6H7H

000

7.0007.0007.000

6.6196.6456.683

0.1060.1320.170

6.5136.5136.513

6.3386.3786.424

0.1500.1900.236

6.1886.1886.188

14h6g8g

00.0260.026

7.0006.9746.974

0.1120.1800.280

6.8886.7946.694

6.3506.3246.324

0.0710.1120.180

6.2796.2126.144

5.6635.5965.528

5H6H7H

000

7.0007.0007.000

6.4686.5006.540

0.1180.1500.190

6.3506.3506.350

6.1076.1536.217

0.1900.2360.300

5.9175.9175.917

8

0.754h6g

00.022

8.0007.978

0.0900.140

7.9107.838

7.5137.491

0.0630.100

7.4507.391

6.9886.929

5H6H7H

000

8.0008.0008.000

7.6197.6457.683

0.1060.1320.170

7.5137.5137.513

7.3387.3787.424

0.1500.1900.236

7.1887.1887.188

14h6g8g

00.0260.026

8.0007.9747.974

0.1120.1800.280

7.8887.7947.694

7.3507.3247.324

0.0710.1120.180

7.2797.2127.144

6.6636.5966.528

5H6H7H

000

8.0008.0008.000

7.4687.5007.540

0.1180.1500.190

7.3507.3507.350

7.1077.1537.217

0.1900.2360.300

6.9176.9176.917

1.254h6g8g

00.0280.028

8.0007.9727.972

0.1320.2120.335

7.8687.7607.637

7.1887.1607.160

0.0750.1180.190

7.1137.0426.970

6.3436.2726.200

5H6H7H

000

8.0008.0008.000

7.3137.3487.388

0.1250.1600.200

7.1887.1887.188

6.8596.9126.982

0.2120.2650.335

6.6476.6476.647

9

0.754h6g

00.022

9.0008.978

0.0900.140

8.9108.838

8.5138.491

0.0630.100

8.4508.391

7.9887.929

5H6H7H

000

9.0009.0009.000

8.6198.6458.683

0.1060.1320.170

8.5138.5138.513

8.3388.3788.424

0.1500.1900.236

8.1888.1888.188

14h6g8g

00.0260.026

9.0008.9748.974

0.1120.1800.280

8.8888.7948.694

8.3508.3248.324

0.0710.1120.180

8.2798.2128.144

7.6637.5967.528

5H6H7H

000

9.0009.0009.000

8.4688.5008.540

0.1180.1500.190

8.3508.3508.350

8.1078.1538.217

0.1900.2360.300

7.9177.9177.917

1.254h6g8g

00.0280.028

9.0008.9728.972

0.1320.2120.335

8.8688.7608.637

8.1888.1608.160

0.0750.1180.190

8.1138.0427.970

7.3437.2727.200

5H6H7H

000

9.0009.0009.000

8.3138.3488.388

0.1250.1600.200

8.1888.1888.188

7.8597.9127.982

0.2120.2650.335

7.6477.6477.647

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

6©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

10

0.754h6g

00.022

10.0009.978

0.0900.140

9.9109.838

9.5139.491

0.0630.100

9.4509.391

8.9888.929

5H6H7H

000

10.00010.00010.000

9.6199.6459.683

0.1060.1320.170

9.5139.5139.513

9.3389.3789.424

0.1500.1900.236

9.1889.1889.188

14h6g8g

00.0260.026

10.0009.9749.974

0.1120.1800.280

9.8889.7949.694

9.3509.3249.324

0.0710.1120.180

9.2799.2129.144

8.6638.5968.528

5H6H7H

000

10.00010.00010.000

9.4689.5009.540

0.1180.1500.190

9.3509.3509.350

9.1079.1539.217

0.1900.2360.300

8.9178.9178.917

1.254h6g8g

00.0280.028

10.0009.9729.972

0.1320.2120.335

9.8689.7609.637

9.1889.1609.160

0.0750.1180.190

9.1139.0428.970

8.3438.2728.200

5H6H7H

000

10.00010.00010.000

9.3139.3489.388

0.1250.1600.200

9.1889.1889.188

8.8598.9128.982

0.2120.2650.335

8.6478.6478.647

1.54h6g8g

00.0320.032

10.0009.9689.968

0.1500.2360.375

9.8509.7329.593

9.0268.9948.994

0.0850.1320.212

8.9418.8628.782

8.0187.9387.858

5H6H7H

000

10.00010.00010.000

9.1669.2069.250

0.1400.1800.224

9.0269.0269.026

8.6128.6768.751

0.2360.3000.375

8.3768.3768.376

11

0.754h6g

00.022

11.00010.978

0.0900.140

10.91010.838

10.51310.491

0.0630.100

10.45010.391

9.9889.929

5H6H7H

000

11.00011.00011.000

10.61910.64510.683

0.1060.1320.170

10.51310.51310.513

10.33810.37810.424

0.1500.1900.236

10.18810.18810.188

14h6g8g

00.0260.026

11.00010.97410.974

0.1120.1800.280

10.88810.79410.694

10.35010.32410.324

0.0710.1120.180

10.27910.21210.144

9.6639.5969.528

5H6H7H

000

11.00011.00011.000

10.46810.50010.540

0.1180.1500.190

10.35010.35010.350

10.10710.15310.217

0.1900.2360.300

9.9179.9179.917

1.54h6g8g

00.0320.032

11.00010.96810.968

0.1500.2360.375

10.85010.73210.593

10.0269.9949.994

0.0850.1320.212

9.9419.8629.782

9.0188.9388.858

5H6H7H

000

11.00011.00011.000

10.16610.20610.250

0.1400.1800.224

10.02610.02610.026

9.6129.6769.751

0.2360.3000.375

9.3769.3769.376

12

14h6g8g

00.0260.026

12.00011.97411.974

0.1120.1800.280

11.88811.79411.694

11.35011.32411.324

0.0750.1180.190

11.27511.20611.134

10.65910.59010.518

5H6H7H

000

12.00012.00012.000

11.47511.51011.550

0.1250.1600.200

11.35011.35011.350

11.10711.15311.217

0.1900.2360.300

10.91710.91710.917

1.254h6g8g

00.0280.028

12.00011.97211.972

0.1320.2120.335

11.86811.76011.637

11.18811.16011.160

0.0850.1320.212

11.10311.02810.948

10.33310.25710.177

5H6H7H

000

12.00012.00012.000

11.32811.36811.412

0.1400.1800.224

11.18811.18811.188

10.85910.91210.982

0.2120.2650.335

10.64710.64710.647

1.54h6g8g

00.0320.032

12.00011.96811.968

0.1500.2360.375

11.85011.73211.593

11.02610.99410.994

0.0900.1400.224

10.93610.85410.770

10.0129.9309.846

5H6H7H

000

12.00012.00012.000

11.17611.21611.262

0.1500.1900.236

11.02611.02611.026

10.61210.67610.751

0.2360.3000.375

10.37610.37610.376

1.754h6g8g

00.0340.034

12.00011.96611.966

0.1700.2650.425

11.83011.70111.541

10.86310.82910.829

0.0950.1500.236

10.768 10.67910.593

9.6929.6029.516

5H6H7H

000

12.00012.00012.000

11.02311.06311.113

0.1600.2000.250

10.86310.86310.863

10.37110.44110.531

0.2650.3350.425

10.10610.10610.106

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

7

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

14

14h6g8g

00.0260.026

14.00013.97413.974

0.1120.1800.280

13.88813.79413.694

13.35013.32413.324

0.0750.1180.190

13.27513.20613.134

12.65912.59012.518

5H6H7H

000

14.00014.00014.000

13.47513.51013.550

0.1250.1600.200

13.35013.35013.350

13.10713.15313.217

0.1900.2360.300

12.91712.91712.917

1.254h6g8g

00.0280.028

14.00013.97213.972

0.1320.2120.335

13.86813.76013.637

13.18813.16013.160

0.0850.1320.212

13.10313.02812.948

12.33312.25712.177

5H6H7H

000

14.00014.00014.000

13.32813.36813.412

0.1400.1800.224

13.18813.18813.188

12.85912.91212.982

0.2120.2650.335

12.64712.64712.647

1.54h6g8g

00.0320.032

14.00013.96813.968

0.1500.2360.375

13.85013.73213.593

13.02612.99412.994

0.0900.1400.224

12.93612.85412.770

12.01211.93011.846

5H6H7H

000

14.00014.00014.000

13.17613.21613.262

0.1500.1900.236

13.02613.02613.026

12.61212.67612.751

0.2360.3000.375

12.37612.37612.376

24h6g8g

00.0380.038

14.00013.96213.962

0.1800.2800.450

13.82013.68213.512

12.70112.66312.663

0.1000.1600.250

12.60112.50312.413

11.36911.27111.181

5H6H7H

000

14.00014.00014.000

12.87112.91312.966

0.1700.2120.265

12.70112.70112.701

12.13512.21012.310

0.3000.3750.475

11.83511.83511.835

15

14h6g8g

00.0260.026

15.00014.97414.974

0.1120.1800.280

14.88814.79414.694

14.35014.32414.324

0.0750.1180.190

14.27514.20614.134

13.65913.59013.518

5H6H7H

000

15.00015.00015.000

14.47514.51014.550

0.1250.1600.200

14.35014.35014.350

14.10714.15314.217

0.1900.2360.300

13.91713.91713.917

1.54h6g8g

00.0320.032

15.00014.96814.968

0.1500.2360.375

14.85014.73214.593

14.02613.99413.994

0.0900.1400.224

13.93613.85413.770

13.01212.93012.846

5H6H7H

000

15.00015.00015.000

14.17614.21614.262

0.1500.1900.236

14.02614.02614.026

13.61213.67613.751

0.2360.3000.375

13.37613.37613.376

16

14h6g8g

00.0260.026

16.00015.97415.974

0.1120.1800.280

15.88815.79415.694

15.35015.32415.324

0.0750.1180.190

15.27515.20615.134

14.65914.59014.518

5H6H7H

000

16.00016.00016.000

15.47515.51015.550

0.1250.1600.200

15.35015.35015.350

15.10715.15315.217

0.1900.2360.300

14.91714.91714.917

1.54h6g8g

00.0320.032

16.00015.96815.968

0.1500.2360.375

15.85015.73215.593

15.02614.99414.994

0.0900.1400.224

14.93614.85414.770

14.01213.93013.846

5H6H7H

000

16.00016.00016.000

15.17615.21615.262

0.1500.1900.236

15.02615.02615.026

14.61214.67614.751

0.2360.3000.375

14.37614.37614.376

24h6g8g

00.0380.038

16.00015.96215.962

0.1800.2800.450

15.82015.68215.512

14.70114.66314.663

0.1000.1600.250

14.60114.50314.413

13.36913.27113.181

5H6H7H

000

16.00016.00016.000

14.87114.91314.966

0.1700.2120.265

14.70114.70114.701

14.13514.21014.310

0.3000.3750.475

13.83513.83513.835

17

14h6g8g

00.0260.026

17.00016.97416.974

0.1120.1800.280

16.88816.79416.694

16.35016.32416.324

0.0750.1180.190

16.27516.20616.134

15.65915.59015.518

5H6H7H

000

17.00017.00017.000

16.47516.51016.550

0.1250.1600.200

16.35016.35016.350

16.10716.15316.217

0.1900.2360.300

15.91715.91715.917

1.54h6g8g

00.0320.032

17.00016.96816.968

0.1500.2360.375

16.85016.73216.593

16.02615.99415.994

0.0900.1400.224

15.93615.85415.770

15.01214.93014.846

5H6H7H

000

17.00017.00017.000

16.17616.21616.262

0.1500.1900.236

16.02616.02616.026

15.61215.67615.751

0.2360.3000.375

15.37615.37615.376

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

8©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

18

14h6g8g

00.0260.026

18.00017.97417.974

0.1120.1800.280

17.88817.79417.694

17.35017.32417.324

0.0750.1180.190

17.27517.20617.134

16.65916.59016.518

5H6H7H

000

18.00018.00018.000

17.47517.51017.550

0.1250.1600.200

17.35017.35017.350

17.10717.15317.217

0.1900.2360.300

16.91716.91716.917

1.54h6g8g

00.0320.032

18.00017.96817.968

0.1500.2360.375

17.85017.73217.593

17.02616.99416.994

0.0900.1400.224

16.93616.85416.770

16.01215.93015.846

5H6H7H

000

18.00018.00018.000

17.17617.21617.262

0.1500.1900.236

17.02617.02617.026

16.61216.67616.751

0.2360.3000.375

16.37616.37616.376

24h6g8g

00.0380.038

18.00017.96217.962

0.1800.2800.450

17.82017.68217.512

16.70116.66316.663

0.1000.1600.250

16.60116.50316.413

15.36915.27115.181

5H6H7H

000

18.00018.00018.000

16.87116.91316.966

0.1700.2120.265

16.70116.70116.701

16.13516.21016.310

0.3000.3750.475

15.83515.83515.835

2.54h6g8g

00.0420.042

18.00017.95817.958

0.2120.3350.530

17.78817.62317.428

16.37616.33416.334

0.1060.1700.265

16.27016.16416.069

14.73014.62414.529

5H6H7H

000

18.00018.00018.000

16.55616.60016.656

0.1800.2240.280

16.37616.37616.376

15.64915.74415.854

0.3550.4500.560

15.29415.29415.294

20

14h6g8g

00.0260.026

20.00019.97419.974

0.1120.1800.280

19.88819.79419.694

19.35019.32419.324

0.0750.1180.190

19.27519.20619.134

18.65918.59018.518

5H6H7H

000

20.00020.00020.000

19.47519.51019.550

0.1250.1600.200

19.35019.35019.350

19.10719.15319.217

0.1900.2360.300

18.91718.91718.917

1.54h6g8g

00.0320.032

20.00019.96819.968

0.1500.2360.375

19.85019.73219.593

19.02618.99418.994

0.0900.1400.224

18.93618.85418.770

18.01217.93017.846

5H6H7H

000

20.00020.00020.000

19.17619.21619.262

0.1500.1900.236

19.02619.02619.026

18.61218.67618.751

0.2360.3000.375

18.37618.37618.376

24h6g8g

00.0380.038

20.00019.96219.962

0.1800.2800.450

19.82019.68219.512

18.70118.66318.663

0.1000.1600.250

18.60118.50318.413

17.36917.27117.181

5H6H7H

000

20.00020.00020.000

18.87118.91318.966

0.1700.2120.265

18.70118.70118.701

18.13518.21018.310

0.3000.3750.475

17.83517.83517.835

2.54h6g8g

00.0420.042

20.00019.95819.958

0.2120.3350.530

19.78819.62319.428

18.37618.33418.334

0.1060.1700.265

18.27018.16418.069

16.73016.62416.529

5H6H7H

000

20.00020.00020.000

18.55618.60018.656

0.1800.2240.280

18.37618.37618.376

17.64917.74417.854

0.3550.4500.560

17.29417.29417.294

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

9

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

22

14h6g8g

00.0260.026

22.00021.97421.974

0.1120.1800.280

21.88821.79421.694

21.35021.32421.324

0.0750.1180.190

21.27521.20621.134

20.65920.59020.518

5H6H7H

000

22.00022.00022.000

21.47521.51021.550

0.1250.1600.200

21.35021.35021.350

21.10721.15321.217

0.1900.2360.300

20.91720.91720.917

1.54h6g8g

00.0320.032

22.00021.96821.968

0.1500.2360.375

21.85021.73221.593

21.02620.99420.994

0.0900.1400.224

20.93620.85420.770

20.01219.93019.846

5H6H7H

000

22.00022.00022.000

21.17621.21621.262

0.1500.1900.236

21.02621.02621.026

20.61220.67620.751

0.2360.3000.375

20.37620.37620.376

24h6g8g

00.0380.038

22.00021.96221.962

0.1800.2800.450

21.82021.68221.512

20.70120.66320.663

0.1000.1600.250

20.60120.50320.413

19.36919.27119.181

5H6H7H

000

22.00022.00022.000

20.87120.91320.966

0.1700.2120.265

20.70120.70120.701

20.13520.21020.310

0.3000.3750.475

19.83519.83519.835

2.54h6g8g

00.0420.042

22.00021.95821.958

0.2120.3350.530

21.78821.62321.428

20.37620.33420.334

0.1060.1700.265

20.27020.16420.069

18.73018.62418.529

5H6H7H

000

22.00022.00022.000

20.55620.60020.656

0.1800.2240.280

20.37620.37620.376

19.64919.74419.854

0.3350.4500.560

19.29419.29419.294

24

14h6g8g

00.0260.026

24.00023.97423.974

0.1120.1800.280

23.88823.79423.694

23.35023.32423.324

0.0800.1250.200

23.27023.19923.124

22.65422.58322.508

5H6H7H

000

24.00024.00024.000

23.48223.52023.562

0.1320.1700.212

23.35023.35023.350

23.10723.15323.217

0.1900.2360.300

22.91722.91722.917

1.54h6g8g

00.0320.032

24.00023.96823.968

0.1500.2360.375

23.85023.73223.593

23.02622.99422.994

0.0950.1500.236

22.93122.84422.758

22.00721.92021.834

5H6H7H

000

24.00024.00024.000

23.18623.22623.276

0.1600.2000.250

23.02623.02623.026

22.61222.67622.751

0.2360.3000.375

22.37622.37622.376

24h6g8g

00.0380.038

24.00023.96223.962

0.1800.2800.450

23.82023.68223.512

22.70122.66322.663

0.1060.1700.265

22.59522.49322.398

21.36321.26121.166

5H6H7H

000

24.00024.00024.000

22.88122.92522.981

0.1800.2240.280

22.70122.70122.701

22.13522.21022.310

0.3000.3750.475

21.83521.83521.835

34h6g8g

00.0480.048

24.00023.95223.952

0.2360.3750.600

23.76423.57723.352

22.05122.00322.003

0.1250.2000.315

21.92621.80321.688

20.07819.95519.840

5H6H7H

000

24.00024.00024.000

22.26322.31622.386

0.2120.2650.335

22.05122.05122.051

21.15221.25221.382

0.4000.5000.630

20.75220.75220.752

25

14h6g8g

00.0260.026

25.00024.97424.974

0.1120.1800.280

24.88824.79424.694

24.35024.32424.324

0.0800.1250.200

24.27024.19924.124

23.65423.58323.508

5H6H7H

000

25.00025.00025.000

24.48224.52024.562

0.1320.1700.212

24.35024.35024.350

24.10724.15324.217

0.1900.2360.300

23.91723.91723.917

1.54h6g8g

00.0320.032

25.00024.96824.968

0.1500.2360.375

24.85024.73224.593

24.02623.99423.994

0.0950.1500.236

23.93123.84423.758

23.00722.92022.834

5H6H7H

000

25.00025.00025.000

24.18624.22624.276

0.1600.2000.250

24.02624.02624.026

23.61223.67623.751

0.2360.3000.375

23.37623.37623.376

24h6g8g

00.0380.038

25.00024.96224.962

0.1800.2800.450

24.82024.68224.512

23.70123.66323.663

0.1060.1700.265

23.59523.49323.398

22.36322.26122.166

5H6H7H

000

25.00025.00025.000

23.88123.92523.981

0.1800.2240.280

23.70123.70123.701

23.13523.21023.310

0.3000.3750.475

22.83522.83522.835

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

10©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

26 1.54h6g8g

00.0320.032

26.00025.96825.968

0.1500.2360.375

25.85025.73225.593

25.02624.99424.994

0.0950.1500.236

24.93124.84424.758

24.00723.92023.834

5H6H7H

000

26.00026.00026.000

25.18625.22625.276

0.1600.2000.250

25.02625.02625.026

24.61224.67624.751

0.2360.3000.375

24.37624.37624.376

27

14h6g8g

00.0260.026

27.00026.97426.974

0.1120.1800.280

26.88826.79426.694

26.35026.32426.324

0.0800.1250.200

26.27026.19926.124

25.65425.58325.508

5H6H7H

000

27.00027.00027.000

26.48226.52026.562

0.1320.1700.212

26.35026.35026.350

26.10726.15326.217

0.1900.2360.300

25.91725.91725.917

1.54h6g8g

00.0320.032

27.00026.96826.968

0.1500.2360.375

26.85026.73226.593

26.02625.99425.994

0.0950.1500.236

25.93125.84425.758

25.00724.92024.834

5H6H7H

000

27.00027.00027.000

26.18626.22626.276

0.1600.2000.250

26.02626.02626.026

25.61225.67622.751

0.2360.3000.375

25.37625.37625.376

24h6g8g

00.0380.038

27.00026.96226.962

0.1800.2800.450

26.82026.68226.512

25.70125.66325.663

0.1060.1700.265

25.59525.49325.398

24.36324.26124.166

5H6H7H

000

27.00027.00027.000

25.88125.92525.981

0.1800.2240.280

25.70125.70125.701

25.13525.21025.310

0.3000.3750.475

24.83524.83524.835

34h6g8g

00.0480.048

27.00026.95226.952

0.2360.3750.600

26.76426.57726.352

25.05125.00325.003

0.1250.2000.315

24.92624.80324.688

23.07822.95522.840

5H6H7H

000

27.00027.00027.000

25.26325.31625.386

0.2120.2650.335

25.05125.05125.051

24.15224.25224.382

0.4000.5000.630

23.75223.75223.752

28

14h6g8g

00.0260.026

28.00027.97427.974

0.1120.1800.280

27.88827.79427.694

27.35027.32427.324

0.0800.1250.200

27.27027.19927.124

26.65426.58326.508

5H6H7H

000

28.00028.00028.000

27.48227.52027.562

0.1320.1700.212

27.35027.35027.350

27.10727.15327.217

0.1900.2360.300

26.91726.91726.917

1.54h6g8g

00.0320.032

28.00027.96827.968

0.1500.2360.375

27.85027.73227.593

27.02626.99426.994

0.0950.1500.236

26.93126.84426.758

26.00725.92025.834

5H6H7H

000

28.00028.00028.000

27.18627.22627.276

0.1600.2000.250

27.02627.02627.026

26.61226.67626.751

0.2360.3000.375

26.37626.37626.376

24h6g8g

00.0380.038

28.00027.96227.962

0.1800.2800.450

27.82027.68227.512

26.70126.66326.663

0.1060.1700.265

26.59526.49326.390

25.36325.26125.166

5H6H7H

000

28.00028.00028.000

26.88126.92526.981

0.1800.2240.280

26.70126.70126.701

26.13526.21026.310

0.3000.3750.475

25.83525.83525.835

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

11

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

30

14h6g8g

00.0260.026

30.00029.97429.974

0.1120.1800.280

29.88829.79429.694

29.35029.32429.324

0.0800.1250.200

29.27029.19929.124

28.65428.58328.508

5H6H7H

000

30.00030.00030.000

29.48229.52029.562

0.1320.1700.212

29.35029.35029.350

29.10729.15329.217

0.1900.2360.300

28.91728.91728.917

1.54h6g8g

00.0320.032

30.00029.96829.968

0.1500.2360.375

29.85029.73229.593

29.02628.99428.994

0.0950.1500.236

28.93128.84428.758

28.00727.92027.834

5H6H7H

000

30.00030.00030.000

29.18629.22629.276

0.1600.2000.250

29.02629.02629.026

28.61228.67628.751

0.2360.3000.375

28.37628.37628.376

24h6g8g

00.0380.038

30.00029.96229.962

0.1800.2800.450

29.82029.68229.512

28.70128.66328.663

0.1060.1700.265

28.59528.49328.398

27.36327.26127.166

5H6H7H

000

30.00030.00030.000

28.88128.92528.981

0.1800.2240.280

28.70128.70128.701

28.13528.21028.310

0.3000.3750.475

27.83527.83527.835

34h6g8g

00.0480.048

30.00029.95229.952

0.2360.3750.600

29.76429.57729.352

28.05128.00328.003

0.1250.2000.315

27.92627.80327.688

26.07825.95525.840

5H6H7H

000

30.00030.00030.000

28.26328.31628.386

0.2120.2650.335

28.05128.05128.051

27.15227.25227.382

0.4000.5000.630

26.75226.75226.752

3.54h6g8g

00.0530.053

30.00029.94729.947

0.2650.4250.670

29.73529.52229.277

27.72727.67427.674

0.1320.2120.335

27.59527.46227.339

25.43825.30525.182

5H6H7H

000

30.00030.00030.000

27.95128.00728.082

0.2240.2800.355

27.72727.72727.727

26.66126.77126.921

0.4500.5600.710

26.21126.21126.211

32

1.54h6g8g

00.0320.032

32.00031.96831.968

0.1500.2360.375

31.85031.73231.593

31.02630.99430.994

0.0950.1500.236

30.93130.84430.758

30.00729.92029.834

5H6H7H

000

32.00032.00032.000

31.18631.22631.276

0.1600.2000.250

31.02631.02631.026

30.61230.67630.751

0.2360.3000.375

30.37630.37630.376

24h6g8g

00.0380.038

32.00031.96231.962

0.1800.2800.450

31.82031.68231.512

30.70130.66330.663

0.1060.1700.265

30.59530.49330.398

29.36329.26129.166

5H6H7H

000

32.00032.00032.000

30.88130.92530.981

0.1800.2240.280

30.70130.70130.701

30.13530.21030.310

0.3000.3750.475

29.83529.83529.835

33

1.54h6g8g

00.0320.032

33.00032.96832.968

0.1500.2360.375

32.85032.73232.593

32.02631.99431.994

0.0950.1500.236

31.93131.84431.758

31.00730.92030.834

5H6H7H

000

33.00033.00033.000

32.18632.22632.276

0.1600.2000.250

32.02632.02632.026

31.61231.67631.751

0.2360.3000.375

31.37631.37631.376

24h6g8g

00.0380.038

33.00032.96232.962

0.1800.2800.450

32.82032.68232.512

31.70131.66331.663

0.1060.1700.265

31.59531.49331.398

30.36330.26130.166

5H6H7H

000

33.00033.00033.000

31.88131.92531.981

0.1800.2240.280

31.70131.70131.701

31.13531.21031.310

0.3000.3750.475

30.83530.83530.835

34h6g8g

00.0480.048

33.00032.95232.952

0.2360.3750.600

32.76432.57732.352

31.05131.00331.003

0.1250.2000.315

30.92630.80330.688

29.07828.95528.840

5H6H7H

000

33.00033.00033.000

31.26331.31631.386

0.2120.2650.335

31.05131.05131.051

31.15230.25230.382

0.4000.5000.630

29.75229.75229.752

3.54h6g8g

00.0530.053

33.00032.94732.947

0.2650.4250.670

32.73532.52232.277

30.72730.67430.674

0.1320.2120.335

30.59530.46230.339

28.43828.30528.182

5H6H7H

000

33.00033.00033.000

30.95131.00731.082

0.2240.2800.355

30.72730.72730.727

29.66129.77129.921

0.4500.5600.710

29.21129.21129.211

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

12©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

35 1.54h6g8g

00.0320.032

35.00034.96834.968

0.1500.2360.375

34.85034.73234.593

34.02633.99433.994

0.0950.1500.236

33.93133.84433.758

33.00732.92032.834

5H6H7H

000

35.00035.00035.000

34.18634.22634.276

0.1600.2000.250

34.02634.02634.026

33.61233.67633.751

0.2360.3000.375

33.37633.37633.376

36

1.54h6g8g

00.0320.032

36.00035.96835.968

0.1500.2360.375

35.85035.73235.593

35.02634.99434.994

0.0950.1500.236

34.93134.84434.758

34.00733.92033.834

5H6H7H

000

36.00036.00036.000

35.18635.22635.276

0.1600.2000.250

35.02635.02635.026

34.61234.67634.751

0.2360.3000.375

34.37634.37634.376

24h6g8g

00.0380.038

36.00035.96235.962

0.1800.2800.450

35.82035.68235.512

34.70134.66334.663

0.1060.1700.265

34.59534.49334.398

33.36333.26133.166

5H6H7H

000

36.00036.00036.000

34.88134.92534.981

0.1800.2240.280

34.70134.70134.701

34.13534.21034.310

0.3000.3750.475

33.83533.83533.835

34h6g8g

00.0480.048

36.00035.95235.952

0.2360.3750.600

35.76435.57735.352

34.05134.00334.003

0.1250.2000.315

33.92633.80333.688

32.07831.95531.840

5H6H7H

000

36.00036.00036.000

34.26334.31634.386

0.2120.2650.335

34.05134.05134.051

33.15233.25233.382

0.4000.5000.630

32.75232.75232.752

44h6g8g

00.0600.060

36.00035.94035.940

0.3000.4750.750

35.70035.46535.190

33.40233.34233.342

0.1400.2240.355

33.26233.11832.987

30.79830.65430.523

5H6H7H

000

36.00036.00036.000

33.63833.70233.777

0.2360.3000.375

33.40233.40233.402

32.14532.27032.420

0.4750.6000.750

31.67031.67031.670

38 1.54h6g8g

00.0320.032

38.00037.96837.968

0.1500.2360.376

37.85037.73237.593

37.02636.99436.994

0.0950.1500.236

36.93136.84436.758

36.00735.92035.834

5H6H7H

000

38.00038.00038.000

37.18637.22637.276

0.1600.2000.250

37.02637.02637.026

33.61236.67636.751

0.2360.3000.375

36.37636.37636.376

39

1.54h6g8g

00.0320.032

39.00038.96833.968

0.1500.2630.375

38.85038.73237.593

38.02637.99437.994

0.0950.1500.236

37.93137.84437.758

37.00736.92036.834

5H6H7H

000

39.00039.00039.000

38.18638.22638.276

0.1600.2000.250

38.02638.02638.026

37.61237.67637.751

0.2360.3000.375

37.37637.37637.376

24h6g8g

00.0380.038

39.00038.96238.962

0.1800.2800.450

38.82038.68238.512

37.70137.66337.663

0.1060.1700.265

37.59537.49337.398

36.36336.26136.166

5H6H7H

000

39.00039.00039.000

37.88137.92537.981

0.1800.2240.280

37.70137.70137.701

37.13537.21037.310

0.3000.3750.475

36.83536.83536.835

34h6g8g

00.0480.048

39.00038.95238.952

0.2360.3750.600

38.76438.57738.352

37.05137.00337.003

0.1250.2000.315

36.92636.80336.688

35.07834.95534.840

5H6H7H

000

39.00039.00039.000

37.26337.31637.386

0.2120.2650.335

37.05137.05137.051

36.15236.25236.382

0.4000.5000.630

35.75235.75235.752

44h6g8g

00.0600.060

39.00038.94038.940

0.3000.4750.750

38.70038.46538.190

36.40236.34236.342

0.1400.2240.355

36.26236.11835.987

33.79833.65433.523

5H6H7H

000

39.00039.00039.000

36.63836.70236.777

0.2360.3000.375

36.40236.40236.402

35.14535.27035.420

0.4750.6000.750

34.67034.67034.670

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

13

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

40

1.54h6g8g

00.0320.032

40.00039.96839.968

0.1500.2360.375

39.85038.73239.593

39.02638.99438.994

0.0950.1500.236

38.93138.84438.758

38.00737.92037.834

5H6H7H

000

40.00040.00040.000

39.18639.22639.276

0.1600.2000.250

39.02639.02639.026

38.61238.67638.751

0.2360.3000.375

38.37638.37638.376

24h6g8g

00.0380.038

40.00039.96239.962

0.1800.2800.450

39.82039.68239.512

38.70138.66338.663

0.1060.1700.265

38.59538.49338.398

37.36337.26137.166

5H6H7H

000

40.00040.00040.000

38.88138.92538.981

0.1800.2240.280

38.70138.70138.701

38.13538.21038.310

0.3000.3750.475

37.83537.83537.835

34h6g8g

00.0480.048

40.00039.95239.952

0.2360.3750.600

39.76439.57739.352

38.05138.00338.003

0.1250.2000.315

37.92637.80337.688

36.07835.95535.840

5H6H7H

000

40.00040.00040.000

38.26338.31638.386

0.2120.2650.335

38.05138.05138.051

37.15237.25237.382

0.4000.5000.630

36.75236.75236.752

42

1.54h6g8g

00.0320.032

42.00041.96841.968

0.1500.2360.375

41.85041.73241.593

41.02640.99440.994

0.0950.1500.236

40.93140.84440.758

40.00739.92039.834

5H6H7H

000

42.00042.00042.000

41.18641.22641.276

0.1600.2000.250

41.02641.02641.026

40.61240.67640.751

0.2360.3000.375

40.37640.37640.376

24h6g8g

00.0380.038

42.00041.96241.962

0.1800.2800.450

41.82041.68241.512

40.70140.66340.663

0.1060.1700.265

40.59540.49340.398

39.36339.26139.166

5H6H7H

000

42.00042.00042.000

40.88140.92540.981

0.1800.2240.280

40.70140.70140.701

40.13540.21040.310

0.3000.3750.475

39.83539.83539.835

34h6g8g

00.0480.048

42.00041.95241.952

0.2360.3750.600

41.76441.57741.352

40.05140.00340.003

0.1250.2000.315

39.92639.80339.688

38.07837.95537.840

5H6H7H

000

42.00042.00042.000

40.26340.31640.386

0.2120.2650.335

40.05140.05140.051

39.15239.25239.382

0.4000.5000.630

38.75238.75238.752

44h6g8g

00.0600.060

42.00041.94041.940

0.3000.4750.750

41.70041.46541.190

39.40239.34239.342

0.1400.2240.355

39.26239.11838.987

36.79836.65436.523

5H6H7H

000

42.00042.00042.000

39.63839.70239.777

0.2360.3000.375

39.40239.40239.402

38.14538.27038.420

0.4750.6000.750

37.67037.67037.670

4.54h6g8g

00.0630.063

42.00041.93741.937

0.3150.5000.800

41.68541.43741.137

39.07739.01439.014

0.1500.2360.375

38.92738.77838.639

36.15536.00635.867

5H6H7H

000

42.00042.00042.000

39.32739.39239.477

0.2500.3150.400

39.07739.07739.077

37.65937.79937.979

0.5300.6700.850

37.12937.12937.129

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

14©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

45

1.54h6g8g

00.0320.032

45.00044.96844.968

0.1500.2360.375

44.85044.73244.593

44.02643.99443.994

0.0950.1500.236

43.93143.84443.758

43.00742.92042.834

5H6H7H

000

45.00045.00045.000

44.18644.22644.276

0.1600.2000.250

44.02644.02644.026

43.61243.67643.751

0.2360.3000.375

43.37643.37643.376

2.04h6g8g

00.0380.038

45.00044.96244.962

0.1800.2800.450

44.82044.68244.512

43.70143.66343.663

0.1060.1700.265

43.59543.49343.398

42.36342.26142.166

5H6H7H

000

45.00045.00045.000

43.88143.92543.981

0.1800.2240.280

43.70143.70143.701

43.13543.21043.310

0.3000.3750.475

42.83542.83542.835

3.04h6g8g

00.0480.048

45.00044.95244.952

0.2360.3750.600

44.76444.57744.352

43.05143.00343.003

0.1250.2000.315

42.92642.80342.688

41.07840.95540.840

5H6H7H

000

45.00045.00045.000

43.26343.31643.386

0.2120.2650.335

43.05143.05143.051

42.15242.25242.382

0.4000.5000.630

41.75241.75241.752

4.04h6g8g

00.0600.060

45.00044.94044.940

0.3000.4750.750

44.70044.46544.190

42.40242.34242.342

0.1400.2240.355

42.26242.11841.987

39.79839.65439.523

5H6H7H

000

45.00045.00045.000

42.63842.70242.777

0.2360.3000.375

42.40242.40242.402

41.14541.27041.420

0.4750.6000.750

40.67040.67040.670

4.54h6g8g

00.0630.063

45.00044.93744.937

0.3150.5000.800

44.68544.43744.137

42.07742.01442.014

0.1500.2360.375

41.92741.77841.639

39.15539.00638.867

5H6H7H

000

45.00045.00045.000

42.32742.39242.477

0.2500.3150.400

42.07742.07742.077

40.65940.79940.979

0.5300.6700.850

40.12940.12940.129

48

1.54h6g8g

00.0320.032

48.00047.96847.968

0.1500.2360.375

47.85047.73247.593

47.02646.99446.994

0.1000.1600.250

46.92646.83446.744

46.00245.91045.820

5H6H7H

000

48.00048.00048.000

47.19647.23847.291

0.1700.2120.265

47.02647.02647.026

46.61246.67646.751

0.2360.3000.375

46.37646.37646.376

2.04h6g8g

00.0380.038

48.00047.96247.962

0.1800.2800.450

47.82047.68247.512

46.70146.66346.663

0.1120.1800.280

46.58946.48346.383

45.35745.25145.151

5H6H7H

000

48.00048.00048.000

46.89146.93747.001

0.1900.2360.300

46.70146.70146.701

46.13546.21046.310

0.3000.3750.475

45.83545.83545.835

3.04h6g8g

00.0480.048

48.00047.95247.952

0.2360.3750.600

47.76447.57747.352

46.05146.00346.003

0.1320.2120.335

45.91945.79145.668

44.07143.94343.820

5H6H7H

000

48.00048.00048.000

46.27546.33146.406

0.2240.2800.355

46.05146.05146.051

45.15245.25245.382

0.4000.5000.630

44.75244.75244.752

4.04h6g8g

00.0600.060

48.00047.94047.940

0.3000.4750.750

47.70047.46547.190

45.40245.34245.342

0.1500.2360.375

45.25245.10644.967

42.78842.64242.503

5H6H7H

000

48.00048.00048.000

45.65245.71745.802

0.2500.3150.400

45.40245.40245.402

44.14544.27044.420

0.4750.6000.750

43.67043.67043.670

5.0 4h6g8g

00.0710.071

48.00047.92947.929

0.3550.5300.850

47.66547.39947.079

44.75244.68144.681

0.1600.2500.400

44.59244.43144.281

41.51241.35141.201

5H6H7H

000

48.00048.00048.000

45.01745.08745.177

0.2650.3350.425

44.75244.75244.752

43.14743.29743.487

0.5600.7100.900

42.58742.58742.587

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

15

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

50

1.54h6g8g

00.0320.032

50.00049.96849.968

0.1500.2360.375

49.85049.73249.593

49.02648.99448.994

0.1000.1600.250

48.92648.83448.744

48.00247.91047.820

5H6H7H

000

50.00050.00050.000

49.19649.23849.291

0.1700.2120.265

49.02649.02649.026

48.61248.67648.751

0.2360.3000.375

48.37648.37648.376

2.04h6g8g

00.0380.038

50.00049.96249.962

0.1800.2800.450

49.82049.68249.512

48.70148.66348.663

0.1120.1800.280

48.58948.48348.383

47.35747.25147.151

5H6H7H

000

50.00050.00050.000

48.89148.93749.001

0.1900.2360.300

48.70148.70148.701

48.13548.21048.310

0.3000.3750.475

47.83547.83547.835

3.04h6g8g

00.0480.048

50.00049.95249.952

0.2360.3750.600

49.76449.57749.352

48.05148.00348.003

0.1320.2120.335

47.91947.79147.668

46.07145.94345.820

5H6H7H

000

50.00050.00050.000

48.27548.33148.406

0.2240.2800.355

48.05148.05148.051

47.15247.25247.382

0.4000.5000.630

46.75246.75246.752

52

1.54h6g8g

00.0320.032

52.00051.96851.968

0.1500.2360.375

51.85051.73251.593

51.02650.99450.994

0.1000.1600.250

50.92650.83450.744

50.00249.91049.820

5H6H7H

000

52.00052.00052.000

51.19651.23851.291

0.1700.2120.265

51.02651.02651.026

50.61250.67650.751

0.2360.3000.375

50.37650.37650.376

2.04h6g8g

00.0380.038

52.00051.96251.962

0.1800.2800.450

51.82051.68251.512

50.70150.66350.663

0.1120.1800.280

50.58950.48350.383

49.35749.25149.151

5H6H7H

000

52.00052.00052.000

50.89150.93751.001

0.1900.2360.300

50.70150.70150.701

50.13550.21050.310

0.3000.3750.475

49.83549.83549.835

3.04h6g8g

00.0480.048

52.00051.95251.952

0.2360.3750.600

51.76451.57751.352

50.05150.00350.003

0.1320.2120.335

49.91949.79149.668

48.07147.94347.820

5H6H7H

000

52.00052.00052.000

50.27550.33150.406

0.2240.2800.355

50.05150.05150.051

49.15249.25249.382

0.4000.5000.630

48.75248.75248.752

4.04h6g8g

00.0600.060

52.00051.94051.940

0.3000.4750.750

51.70051.46551.190

49.40249.34249.342

0.1500.2360.375

49.25249.10648.967

46.78846.64246.503

5H6H7H

000

52.00052.00052.000

49.65249.71749.802

0.2500.3150.400

49.40249.40249.402

48.14548.27048.420

0.4750.6000.750

47.67047.67047.670

5.0 4h6g8g

00.0710.071

52.00051.92951.929

0.3350.5300.850

51.66551.39951.079

48.75248.68148.681

0.1600.2500.400

48.59248.43148.281

45.51245.35145.201

5H6H7H

000

52.00052.00052.000

49.01749.08749.177

0.2650.3350.425

48.75248.75248.752

47.14747.29747.687

0.5600.7100.900

46.58746.58746.587

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

16©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

55

1.54h6g8g

00.0320.032

55.00054.96854.968

0.1500.2360.375

54.85054.73254.593

54.02653.99453.994

0.1000.1600.250

53.92653.83453.744

53.00252.91052.820

5H6H7H

000

55.00055.00055.000

54.19654.23854.291

0.1700.2120.265

54.02654.02654.026

53.61253.67653.751

0.2360.3000.375

53.37653.37653.376

2.04h6g8g

00.0380.038

55.00054.96254.962

0.1800.2800.450

54.82054.68254.512

53.70153.66353.663

0.1120.1800.280

53.58953.48353.383

52.35752.25152.151

5H6H7H

000

55.00055.00055.000

53.89153.93754.001

0.1900.2360.300

53.70153.70153.701

53.13553.21053.310

0.3000.3750.475

52.83552.83552.835

3.04h6g8g

00.0480.048

55.00054.95254.952

0.2360.3750.600

54.76454.57754.352

53.05153.00353.003

0.1320.2120.335

52.91952.79152.668

51.07150.94350.820

5H6H7H

000

55.00055.00055.000

53.27553.33153.406

0.2240.2800.355

53.05153.05153.051

52.15252.25252.382

0.4000.5000.630

51.75251.75251.752

4.04h6g8g

00.0600.060

55.00054.94054.940

0.3000.4750.750

54.70054.46554.190

52.40252.34252.342

0.1500.2360.375

52.25252.10651.967

49.78849.64249.503

5H6H7H

000

55.00055.00055.000

52.65252.71752.802

0.2500.3150.400

52.40252.40252.402

51.14551.27051.420

0.4750.6000.750

50.67050.67050.670

56

1.54h6g8g

00.0320.032

56.00055.96855.968

0.1500.2360.375

55.85055.73255.593

55.02654.99454.994

0.1000.1600.250

54.92654.83454.744

54.00253.91053.820

5H6H7H

000

56.00056.00056.000

55.19655.23855.291

0.1700.2120.265

55.02655.02655.026

54.61254.67654.751

0.2360.3000.375

54.37654.37654.376

2.04h6g8g

00.0380.038

56.00055.96255.962

0.1800.2800.450

55.82055.68255.512

54.70154.66354.663

0.1120.1800.280

54.58954.48354.383

53.35753.25153.151

5H6H7H

000

56.00056.00056.000

54.89154.93755.001

0.1900.2360.300

54.70154.70154.701

54.13554.21054.310

0.3000.3750.475

53.83553.83553.835

3.04h6g8g

00.0480.048

56.00055.95255.952

0.2360.3750.600

55.76455.57755.352

54.05154.00354.003

0.1320.2120.335

53.91953.79153.668

52.07151.94351.820

5H6H7H

000

56.00056.00056.000

54.27554.33154.406

0.2240.2800.355

54.05154.05154.051

53.15253.25253.382

0.4000.5000.630

52.75252.75252.752

4.04h6g8g

00.0600.060

56.00055.94055.940

0.3000.4750.750

55.70055.46555.190

53.40253.34253.342

0.1500.2360.375

53.25253.10652.967

50.78850.64250.503

5H6H7H

000

56.00056.00056.000

53.65253.71753.802

0.2500.3150.400

53.40253.40253.402

52.14552.27052.430

0.4750.6000.750

51.67051.67051.670

5.5 4h6g8g

00.0750.075

56.00055.92555.925

0.3550.5600.900

55.64555.36555.025

52.42852.35352.353

0.1700.2650.425

52.25852.08851.928

48.87048.70048.540

5H6H7H

000

56.00056.00056.000

52.70852.78352.878

0.2800.3550.450

52.42852.42852.428

50.64650.79650.996

0.6000.7500.950

50.04650.04650.046

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

17

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

58

1.54h6g8g

00.0320.032

58.00057.96857.968

0.1500.2360.375

57.85057.73257.593

57.02656.99456.994

0.1000.1600.250

56.92656.83456.744

56.00255.91055.820

5H6H7H

000

58.00058.00058.000

57.19657.23857.291

0.1700.2120.265

57.02657.02657.026

56.61256.67656.751

0.2360.3000.375

56.37656.37656.376

2.04h6g8g

00.0380.038

58.00057.96257.962

0.1800.2800.450

57.82057.68257.512

56.70156.66356.663

0.1120.1800.280

56.58956.48356.383

55.35755.25155.151

5H6H7H

000

58.00058.00058.000

56.89156.93757.001

0.1900.2360.300

56.70156.70156.701

56.13556.21056.310

0.3000.3750.475

55.83555.83555.835

3.04h6g8g

00.0480.048

58.00057.95257.952

0.2360.3750.600

57.76457.57757.352

56.05156.00356.003

0.1320.2120.335

55.91955.79155.668

54.07153.94353.820

5H6H7H

000

58.00058.00058.000

56.27556.33156.406

0.2240.2800.355

56.05156.05156.051

55.15255.25255.382

0.4000.5000.630

54.75254.75254.752

4.04h6g8g

00.0600.060

58.00057.94057.940

0.3000.4750.750

57.70057.46557.190

55.40255.34255.342

0.1500.2360.375

55.25255.10654.967

52.78852.64252.503

5H6H7H

000

58.00058.00058.000

55.65255.71755.802

0.2500.3150.400

55.40255.40255.402

54.14554.27054.420

0.4750.6000.750

53.67053.67053.670

60

1.54h6g8g

00.0320.032

60.00059.96859.968

0.1500.2360.375

59.85059.73259.593

59.02658.99458.994

0.1000.1600.250

58.92658.83458.744

58.00257.91057.820

5H6H7H

000

60.00060.00060.000

59.19659.23859.291

0.1700.2120.265

59.02659.02659.026

58.61258.67658.751

0.2360.3000.375

58.37658.37658.376

2.04h6g8g

00.0380.038

60.00059.96259.962

0.1800.2800.450

59.82059.68259.512

58.70158.66358.663

0.1120.1800.280

58.58954.48358.383

57.35757.25157.151

5H6H7H

000

60.00060.00060.000

58.89158.93759.001

0.1900.2360.300

58.70158.70158.701

58.13558.21058.310

0.3000.3750.475

57.83557.83557.835

3.04h6g8g

00.0480.048

60.00059.95259.952

0.2360.3750.600

59.76459.57759.352

58.05158.00358.003

0.1320.2120.335

57.91957.79157.668

56.07155.94355.820

5H6H7H

000

60.00060.00060.000

58.27558.33158.406

0.2240.2800.355

58.05158.05158.051

57.15257.25257.382

0.4000.5000.630

56.75256.75256.752

4.04h6g8g

00.0600.060

60.00059.94059.940

0.3000.4750.750

59.70059.46559.190

57.40257.34257.342

0.1500.2360.375

57.25257.10656.967

54.78854.64254.503

5H6H7H

000

60.00060.00060.000

57.65257.71757.802

0.2500.3150.400

57.40257.40257.402

56.14556.27056.420

0.4750.6000.750

55.67055.67055.670

5.54h6g8g

00.0750.075

60.00059.92559.925

0.3550.5600.900

59.64559.36559.025

56.42856.35356.353

0.1700.2650.425

56.25856.08855.928

52.87052.70052.540

5H6H7H

000

60.00060.00060.000

56.70856.78356.878

0.2800.3550.450

56.42856.42856.428

54.64654.79654.996

0.6000.7500.950

54.04654.04654.046

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

18©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

62

1.54h6g8g

00.0320.032

62.00061.96861.968

0.1500.2360.375

61.85061.73261.593

61.02660.99460.994

0.1000.1600.250

60.92660.83460.744

60.00259.91059.820

5H6H7H

000

62.00062.00062.000

61.19661.23861.291

0.1700.2120.265

61.02661.02661.026

60.61260.67660.751

0.2360.3000.375

60.37660.37660.376

24h6g8g

00.0380.038

62.00061.96261.962

0.1800.2800.450

61.82061.68261.512

60.70160.66360.663

0.1120.1800.280

60.58960.48360.383

59.35759.25159.151

5H6H7H

000

62.00062.00062.000

60.89160.93761.001

0.1900.2360.300

60.70160.70160.701

60.13560.21060.310

0.3000.3750.475

59.83559.83559.835

34h6g8g

00.0480.048

62.00061.95261.952

0.2360.3750.600

61.76461.57761.352

60.05160.00360.003

0.1320.2120.335

59.91959.79159.668

58.07157.94357.820

5H6H7H

000

62.00062.00062.000

60.27560.33160.406

0.2240.2800.355

60.05160.05160.051

59.15259.25259.382

0.4000.5000.630

58.75258.75258.752

44h6g8g

00.0600.060

62.00061.94061.940

0.3000.4750.750

61.70061.46561.190

59.40259.34259.342

0.1500.2360.375

59.25259.10658.967

56.78856.64256.503

5H6H7H

000

62.00062.00062.000

59.65259.71759.802

0.2500.3150.400

59.40259.40259.402

58.14558.27058.420

0.4750.6000.750

57.67057.67057.670

64

1.54h6g8g

00.0320.032

64.00063.96863.968

0.1500.2360.375

63.85063.73263.593

63.02662.99462.994

0.1000.1600.250

62.92662.83462.744

62.00261.91061.820

5H6H7H

000

64.00064.00064.000

63.19663.23863.291

0.1700.2120.265

63.02663.02663.026

62.61262.67662.751

0.2360.3000.375

62.37662.37662.376

24h6g8g

00.0380.038

64.00063.96263.962

0.1800.2800.450

63.82063.68263.512

62.70162.66362.663

0.1120.1800.280

62.58962.48362.383

61.35761.25161.151

5H6H7H

000

64.00064.00064.000

62.89162.93763.001

0.1900.2360.300

62.70162.70162.701

62.13562.21062.310

0.3000.3750.475

61.83561.83561.835

34h6g8g

00.0480.048

64.00063.95263.952

0.2360.3750.600

63.76463.57763.352

62.05162.00362.003

0.1320.2120.335

61.91961.79161.668

60.07159.94359.820

5H6H7H

000

64.00064.00064.000

62.27562.33162.406

0.2240.2800.355

62.05162.05162.051

61.15261.25261.382

0.4000.5000.630

60.75260.75260.752

44h6g8g

00.0600.060

64.00063.94063.940

0.3000.4750.750

63.70063.46563.190

61.40261.34261.342

0.1500.2360.375

61.25261.10660.967

58.78858.64258.503

5H6H7H

000

64.00064.00064.000

61.65261.71761.802

0.2500.3150.400

61.40261.40261.402

60.14560.27060.420

0.4750.6000.750

59.67059.67059.670

64h6g8g

00.0800.080

64.00063.92063.920

0.3750.6000.950

63.62563.32062.970

60.10360.02360.023

0.1800.2800.450

59.92359.74359.573

56.22756.04755.877

5H6H7H

000

64.00064.00064.000

60.40360.47860.578

0.3000.3750.475

60.10360.10360.103

58.13558.30558.505

0.6300.8001.000

57.50557.50557.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

19

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagementAll dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

65

1.54h6g8g

00.0320.032

65.00064.96864.968

0.1500.2360.375

64.85064.73264.593

64.02663.99463.994

0.1000.1600.250

63.92668.83463.744

63.00262.91062.820

5H6H7H

000

65.00065.00065.000

64.19664.23864.291

0.1700.2120.265

64.02664.02664.026

63.61263.67663.751

0.2360.3000.375

63.37663.37663.376

24h6g8g

00.0380.048

65.00064.96264.962

0.1800.2800.450

64.82064.68264.512

63.70163.66363.663

0.1120.1800.280

63.58963.48363.383

62.35762.25162.151

5H6H7H

000

65.00065.00065.000

63.89163.93764.001

0.1900.2360.300

63.70163.70163.701

63.13563.21063.310

0.3000.3750.475

62.83562.83562.835

34h6g8g

00.0480.048

65.00064.95264.952

0.2360.3750.600

64.76464.57764.352

63.05163.00363.003

0.1320.2120.335

62.91962.79162.668

61.07160.94360.820

5H6H7H

000

65.00065.00065.000

63.27563.33163.406

0.2240.2800.355

63.05163.05163.051

62.15262.25262.382

0.4000.5000.630

61.75261.75261.752

44h6g8g

00.0600.060

65.00064.94064.940

0.3000.4750.750

64.70064.46564.190

62.40262.34262.342

0.1500.2360.375

62.25262.10661.967

59.78859.64269.503

5H6H7H

000

65.00065.00065.000

62.65262.71762.802

0.2500.3150.400

62.40262.40262.402

61.14561.27061.420

0.4750.6000.750

60.67060.67060.670

68

1.54h6g8g

00.0320.032

68.00067.96867.968

0.1500.2360.375

67.85067.73267.593

67.02666.99466.994

0.1000.1600.250

66.92666.83466.744

66.00265.91065.820

5H6H7H

000

68.00068.00068.000

67.19667.23867.291

0.1700.2120.265

67.02667.02667.026

66.61266.67666.751

0.2360.3000.375

66.37666.37666.376

24h6g8g

00.0380.038

68.00037.96267.962

0.1800.2800.450

67.82067.68267.512

66.70166.66366.663

0.1120.1800.280

66.58966.48366.383

65.35765.25165.151

5H6H7H

000

68.00068.00068.000

66.89166.93767.001

0.1900.2360.300

66.70166.70166.701

66.13566.21066.310

0.3000.3750.475

65.83565.83565.835

34h6g8g

00.0480.048

68.00067.95267.952

0.2360.3750.600

67.76467.57767.352

66.05166.00366.003

0.1320.2120.335

65.91965.79165.668

64.07153.94353.820

5H6H7H

000

68.00068.00068.000

66.27566.33166.406

0.2240.2800.355

66.05166.05166.051

65.15265.25265.382

0.4000.5000.630

64.75264.75264.752

44h6g8g

00.0600.060

68.00067.94067.940

0.3000.4750.750

67.70067.46567.190

65.40265.34265.342

0.1500.2360.375

65.25265.10664.967

62.78862.64262.503

5H6H7H

000

68.00068.00068.000

65.65265.71765.802

0.2500.3150.400

65.40265.40265.402

64.14564.27064.420

0.4750.6000.750

63.67063.67063.670

64h6g8g

00.0800.080

68.00067.92067.920

0.3750.6000.950

67.62567.32066.970

64.10364.02364.023

0.1800.2800.450

63.92363.74363.573

60.22760.04759.877

5H6H7H

000

68.00068.00068.000

64.40364.47864.578

0.3000.3750.475

64.10364.10364.103

62.13562.30562.505

0.6300.8001.000

61.50561.50561.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

20©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

70

1.54h6g8g

00.0320.032

70.00069.96869.968

0.1500.2360.375

69.85069.73269.593

69.02668.99468.994

0.1000.1600.250

68.92668.83468.744

68.00267.91067.820

5H6H7H

000

70.00070.00070.000

69.19669.23869.291

0.1700.2120.265

69.02669.02669.026

68.61268.67668.751

0.2360.3000.375

68.37668.37668.376

24h6g8g

00.0380.038

70.00069.96269.962

0.1800.2800.450

69.82069.68269.512

68.70168.66368.663

0.1120.1800.280

68.58968.48368.383

67.35767.25167.151

5H6H7H

000

70.00070.00070.000

68.89168.93769.001

0.1900.2360.300

68.70168.70168.701

68.13568.21068.310

0.3000.3750.475

67.83567.83567.835

34h6g8g

00.0480.048

70.00069.95269.952

0.2360.3750.600

69.76469.57769.352

68.05168.00368.003

0.1320.2120.335

67.91967.79167.668

66.07165.94365.820

5H6H7H

000

70.00070.00070.000

68.27568.33168.406

0.2240.2800.355

68.05168.05168.051

67.15267.25267.382

0.4000.5000.630

66.75266.75266.752

44h6g8g

00.0600.060

70.00069.94069.940

0.3000.4750.750

69.70069.46569.190

67.40267.34267.342

0.1500.2360.375

67.25267.10666.967

64.78864.64264.503

5H6H7H

000

70.00070.00070.000

67.65267.71767.802

0.2500.3150.400

67.40267.40267.402

66.14566.27066.420

0.4750.6000.750

65.67065.67065.670

64h6g8g

00.0800.080

70.00069.92069.920

0.3750.6000.950

69.62569.32068.970

66.10366.02366.023

0.1800.2800.450

65.92365.74365.573

62.22762.04761.877

5H6H7H

000

70.00070.00070.000

66.40366.47866.578

0.3000.3750.475

66.10366.10366.103

64.13564.30564.505

0.6300.8001.000

63.50563.50563.505

72

1.54h6g8g

00.0320.032

72.00071.96871.968

0.1500.2360.375

71.85071.73271.593

71.02670.99470.994

0.1000.1600.250

70.92670.83470.744

70.00269.91069.820

5H6H7H

000

72.00072.00072.000

71.19671.23871.291

0.1700.2120.265

71.02671.02671.026

70.61270.67670.751

0.2360.3000.375

70.37670.37670.376

24h6g8g

00.0380.038

72.00071.96271.962

0.1800.2800.450

71.82071.68271.512

70.70170.66370.663

0.1120.1800.280

70.58970.48370.383

69.35769.25169.151

5H6H7H

000

72.00072.00072.000

70.89170.93771.001

0.1900.2360.300

70.70170.70170.701

70.13570.21070.310

0.3000.3750.475

69.83569.83569.835

34h6g8g

00.0480.048

72.00071.95271.952

0.2360.3750.600

71.76471.57771.352

70.05170.00370.003

0.1320.2120.335

69.91969.79169.668

68.07167.94367.820

5H6H7H

000

72.00072.00072.000

70.27570.33170.406

0.2240.2800.355

70.05170.05170.051

69.15269.25269.382

0.4000.5000.630

68.75268.75268.752

44h6g8g

00.0600.060

72.00071.94071.940

0.3000.4750.750

71.70071.46571.190

69.40269.34269.342

0.1500.2360.375

69.25269.10669.967

66.78866.64266.503

5H6H7H

000

72.00072.00072.000

69.65269.71769.802

0.2500.3150.400

69.40269.40269.402

68.14568.27068.420

0.4750.6000.750

67.67067.67067.670

64h6g8g

00.0800.080

72.00071.92071.920

0.3750.6000.950

71.62571.32070.970

68.10368.02368.023

0.1800.2800.450

67.92367.74367.573

64.22764.04763.877

5H6H7H

000

72.00072.00072.000

68.40368.47858.578

0.3000.3750.475

68.10368.10368.103

66.13566.30566.505

0.6300.8001.000

65.50565.50565.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

21

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

75

1.54h6g8g

00.0320.032

75.00074.96874.968

0.1500.2360.375

74.85074.73274.593

74.02673.99473.994

0.1000.1600.250

73.92673.83473.744

73.00272.91072.820

5H6H7H

000

75.00075.00075.000

74.19674.23874.291

0.1700.2120.265

74.02674.02674.026

73.61273.67673.751

0.2360.3000.375

73.37673.37673.376

24h6g8g

00.0380.038

75.00074.96274.962

0.1800.2800.450

74.82074.68274.512

73.70173.66373.663

0.1120.1800.280

73.58973.48373.383

72.35772.25172.151

5H6H7H

000

75.00075.00075.000

73.89173.93774.001

0.1900.2360.300

73.70173.70173.701

73.13573.21073.310

0.3000.3750.475

72.83572.83572.835

34h6g8g

00.0480.048

75.00074.95274.952

0.2360.3750.600

74.76474.57774.352

73.05173.00373.003

0.1320.2120.335

72.91972.79172.668

71.07170.94370.820

5H6H7H

000

75.00075.00075.000

73.27573.33173.406

0.2240.2800.355

73.05173.05173.051

72.15272.25272.382

0.4000.5000.630

71.75271.75271.752

44h6g8g

00.0600.060

75.00074.94074.940

0.3000.4750.750

74.70074.46574.190

72.40272.34272.342

0.1500.2360.375

72.25272.10671.967

69.78869.64269.503

5H6H7H

000

75.00075.00075.000

72.65272.71772.802

0.2500.3150.400

72.40272.40272.402

71.14571.27071.420

0.4750.6000.750

70.67070.67070.670

76

1.54h6g8g

00.0320.032

76.00075.96875.968

0.1500.2360.375

75.85075.73275.593

75.02674.99474.994

0.1000.1600.250

74.92674.83474.744

74.00273.91073.820

5H6H7H

000

76.00076.00076.000

75.19675.23875.291

0.1700.2120.265

75.02675.02675.026

74.61274.67674.751

0.2360.3000.375

74.37674.37674.376

24h6g8g

00.0380.038

76.00075.96275.962

0.1800.2800.450

75.82075.68275.512

74.70174.66374.663

0.1120.1800.280

74.58974.48374.383

73.35773.25173.151

5H6H7H

000

76.00076.00076.000

74.89174.93775.001

0.1900.2360.300

74.70174.70174.701

74.13574.21074.310

0.3000.3750.475

73.83573.83573.835

34h6g8g

00.0480.048

76.00075.95275.952

0.2360.3750.600

75.76475.57775.352

74.05174.00374.003

0.1320.2120.335

73.91973.79173.668

72.07171.94371.820

5H6H7H

000

76.00076.00076.000

74.27574.33174.406

0.2240.2800.355

74.05174.05174.051

73.15273.25273.382

0.4000.5000.630

72.75272.75272.752

44h6g8g

00.0600.060

76.00075.94075.940

0.3000.4750.750

75.70075.46575.190

73.40273.34273.342

0.1500.2360.375

73.25273.10672.967

70.78870.64270.503

5H6H7H

000

76.00076.00076.000

73.65273.71773.802

0.2500.3150.400

73.40273.40273.402

72.14572.27072.420

0.4750.6000.750

71.67071.67071.670

64h6g8g

00.0800.080

76.00075.92075.920

0.3750.6000.950

75.62575.32074.970

72.10372.02372.023

0.1800.2800.450

71.92371.74371.573

68.22768.04767.877

5H6H7H

000

76.00076.00076.000

72.40372.47872.578

0.3000.3750.475

72.10372.10372.103

70.13570.30570.505

0.6300.8001.000

69.50569.50569.505

782

4h6g8g

00.0380.038

78.00077.96277.962

0.1800.2800.450

77.82077.68277.512

76.70176.66376.663

0.1120.1800.280

76.58976.48376.383

75.35775.25175.151

5H6H7H

000

78.00078.00078.000

76.89176.93777.001

0.1900.2360.300

76.70176.70176.701

76.13576.21076.310

0.3000.3750.475

75.83575.83575.835

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

22©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

80

1.54h6g8g

00.0320.032

80.00079.96879.968

0.1500.2360.375

79.85079.73279.593

79.02678.99478.994

0.1000.1600.250

78.92678.83478.774

78.00277.91077.820

5H6H7H

000

80.00080.00080.000

79.19679.23879.291

0.1700.2120.265

79.02679.02679.026

78.61278.67678.751

0.2360.3000.375

78.37678.37678.376

24h6g8g

00.0380.038

80.00079.96279.962

0.1800.2800.450

79.82079,68279.512

78.70178.66378.663

0.1120.1800.280

78.58978.48378.383

77.35777.25177.151

5H6H7H

000

80.00080.00080.000

78.89178.93779.001

0.1900.2360.300

78.70178.70178.701

78.13578.21078.310

0.3000.3750.475

77.83577.83577.835

34h6g8g

00.0480.048

80.00079.95279.952

0.2360.3750.600

79.76479.57779.352

78.05178.00378.003

0.1320.2120.335

77.91977.79177.668

76.07175.94375.820

5H6H7H

000

80.00080.00080.000

78.27578.33178.406

0.2240.2800.355

78.05178.05178.051

77.15277.25277.382

0.4000.5000.630

76.75276.75276.752

44h6g8g

00.0600.060

80.00079.94079.940

0.3000.4750.750

79.70079.46579.190

77.40277.34277.342

0.1500.2360.375

77.25277.10676.967

74.78874.64274.503

5H6H7H

000

80.00080.00080.000

77.65277.71777.802

0.2500.3150.400

77.40277.40277.402

76.14576.27076.420

0.4750.6000.750

75.67075.67075.670

64h6g8g

00.0800.080

80.00079.92079.920

0.3750.6000.950

79.62579.32078.970

76.10376.02376.023

0.1800.2800.450

75.92375.74375.573

72.22772.04771.877

5H6H7H

000

80.00080.00080.000

76.40376.47876.578

0.3000.3750.475

76.10376.10376.103

74.13574.30574.505

0.6300.8001.000

73.50573.50573.505

82 24h6g8g

00.0380.038

82.00081.96281.962

0.1800.2800.450

81.82081.68281.512

80.70180.66380.663

0.1120.1800.280

80.58980.48380.383

79.35779.25179.151

5H6H7H

000

82.00082.00082.000

80.89180.93781.001

0.1900.2360.300

80.70180.70180.701

80.13580.21080.310

0.3000.3750.475

79.83579.83579.835

85

24h6g8g

00.0380.038

85.00084.96284.962

0.1800.2800.450

84.82084.68284.512

83.70183.66383.663

0.1120.1800.280

83.58983.48383.383

82.35782.25182.151

5H6H7H

000

85.00085.00085.000

83.89183.93784.001

0.1900.2360.300

83.70183.70183.701

83.13583.21083.310

0.3000.3750.475

82.83582.83582.835

34h6g8g

00.0480.048

85.00084.95284.952

0.2360.3750.600

84.76484.57784.352

83.05183.00383.003

0.1320.2120.335

82.91982.79182.668

81.07180.94380.820

5H6H7H

000

85.00085.00085.000

83.27583.33183.406

0.2240.2800.355

83.05183.05183.051

82.15282.25282.382

0.4000.5000.630

81.75281.75281.752

44h6g8g

00.0600.060

85.00084.94084.940

0.3000.4750.750

84.70084.46584.190

82.40282.34282.342

0.1500.2360.375

82.25282.10681.967

79.78879.64279.503

5H6H7H

000

85.00085.00085.000

82.65282.71782.802

0.2500.3150.400

82.40282.40282.402

81.14581.27081.420

0.4750.6000.750

80.67080.67080.670

64h6g8g

00.0800.080

85.00084.92084.920

0.3750.6000.950

84.62584.32084.970

81.10381.02381.023

0.1800.2800.450

80.92380.74381.573

77.22777.04776.877

5H6H7H

000

85.00085.00085.000

81.40381.47881.578

0.3000.3750.475

81.10381.10381.103

79.13579.30579.505

0.6300.8001.000

78.50578.50578.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

23

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

90

24h6g8g

00.0380.038

90.00089.96289.962

0.1800.2800.450

89.82089.68289.512

88.70188.66388.663

0.1120.1800.280

88.58988.48388.383

87.35787.25187.151

5H6H7H

000

90.00090.00090.000

88.89188.93789.001

0.1900.2360.300

88.70188.70188.701

88.13588.21088.310

0.3000.3750.475

87.83587.83587.835

34h6g8g

00.0480.048

90.00089.95289.952

0.2360.3750.600

89.76489.57789.352

88.05188.00388.003

0.1320.2120.335

87.91987.79187.668

86.07185.94385.820

5H6H7H

000

90.00090.00090.000

88.27588.33188.406

0.2240.2800.355

88.05188.05188.051

87.15287.25287.382

0.4000.5000.630

86.75286.75286.752

44h6g8g

00.0600.060

90.00089.94089.940

0.3000.4750.750

89.70089.46589.190

87.40287.34287.342

0.1500.2360.375

87.25287.10686.967

84.78884.64284.503

5H6H7H

000

90.00090.00090.000

87.65287.71787.802

0.2500.3150.400

87.40287.40287.402

86.14586.27086.420

0.4750.6000.750

85.67085.67085.670

64h6g8g

00.0800.080

90.00089.92089.920

0.3750.6000.950

89.62589.32088.970

86.10386.02386.023

0.1800.2800.450

85.92385.74385.573

82.22782.04781.877

5H6H7H

000

90.00090.00090.000

86.40386.47886.578

0.3000.3750.475

86.10386.10386.103

84.13584.30584.505

0.6300.8001.000

83.50583.50583.505

95

24h6g8g

00.0380.038

95.00094.96294.962

0.1800.2800.450

94.82094.68294.512

93.70193.66393.663

0.1180.1900.300

93.58393.47393.363

92.35192.24192.131

5H6H7H

000

95.00095.00095.000

93.90193.95194.016

0.2000.2500.315

93.70193.70193.701

93.13593.21093.310

0.3000.3750.475

92.83592.83592.835

34h6g8g

00.0480.048

95.00094.95294.952

0.2360.3750.600

94.76494.57794.352

93.05193.00393.003

0.1400.2240.355

92.91192.77992.648

91.06390.93190.800

5H6H7H

000

95.00095.00095.000

93.28793.35193.426

0.2360.3000.375

93.05193.05193.051

92.15292.25292.382

0.4000.5000.630

91.75291.75291.752

44h6g8g

00.0600.060

95.00094.94094.940

0.3000.4750.750

94.70094.46594.190

92.40292.34292.342

0.1600.2500.400

92.24292.09291.942

89.77889.62889.478

5H6H7H

000

95.00095.00095.000

92.66792.73792.827

0.2650.3350.425

92.40292.40292.402

91.14591.27091.420

0.4750.6000.750

90.67090.67090.670

64h6g8g

00.0800.080

95.00094.92094.920

0.3750.6000.950

94.62594.32093.970

91.10391.02391.023

0.1900.3000.475

90.91390.72390.548

87.21787.02786.852

5H6H7H

000

95.00095.00095.000

91.41891.50391.603

0.3150.4000.500

91.10391.10391.103

89.13589.30589.505

0.6300.8001.000

88.50588.50588.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

24©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

100

24h6g8g

00.0380.038

100.00099.96299.962

0.1800.2800.450

99.82099.68299.512

98.70198.66398.663

0.1180.1900.300

98.58398.47398.363

97.35197.24197.131

5H6H7H

000

100.000100.000100.000

98.90198.95199.016

0.2000.2500.315

98.70198.70198.701

98.13598.21098.310

0.3000.3750.475

97.83597.83597.835

34h6g8g

00.0480.048

100.00099.95299.952

0.2360.3750.600

99.76499.57799.352

98.05198.00398.003

0.1400.2240.355

97.91197.77997.648

96.06395.93195.800

5H6H7H

000

100.000100.000100.000

98.28798.35198.426

0.2360.3000.375

98.05198.05198.051

97.15297.25297.382

0.4000.5000.630

96.75296.75296.752

44h6g8g

00.0600.060

100.00099.94099.940

0.3000.4750.750

99.70099.46599.190

97.40297.34297.342

0.1600.2500.400

97.24297.09296.942

94.77894.62894.478

5H6H7H

000

100.000100.000100.000

97.66797.73797.827

0.2650.3350.425

97.40297.40297.402

96.14596.27096.420

0.4750.6000.750

95.67095.67095.670

64h6g8g

00.0800.080

100.00099.92099.920

0.3750.6000.950

99.62599.32098.970

96.10396.02396.023

0.1900.3000.475

95.91395.72395.548

92.21792.02791.852

5H6H7H

000

100.000100.000100.000

96.41896.50396.603

0.3150.4000.500

96.10396.10396.103

94.13594.30594.505

0.6300.8001.000

93.50593.50593.505

105

24h6g8g

00.0380.038

105.000104.962104.962

0.1800.2800.450

104.820104.682104.512

103.701103.663103.663

0.1180.1900.300

103.583103.473103.363

102.351102.241102.131

5H6H7H

000

105.000105.000105.000

103.901103.951104.016

0.2000.2500.315

103.701103.701103.701

103.135103.210103.310

0.3000.3750.475

102.835102.835102.835

34h6g8g

00.0480.048

105.000104.952104.952

0.2360.3750.600

104.764104.577104.352

103.051103.003103.003

0.1400.2240.355

102.911102.779102.648

101.063100.931100.800

5H6H7H

000

105.000105.000105.000

103.287103.351103.426

0.2360.3000.375

103.051103.051103.051

102.152102.252102.382

0.4000.5000.630

101.752101.752101.752

44h6g8g

00.0600.060

105.000104.940104.940

0.3000.4750.750

104.700104.465104.190

102.402102.342102.342

0.1600.2500.400

102.242102.092101.942

99.77899.62899.478

5H6H7H

000

105.000105.000105.000

102.667102.737102.827

0.2650.3350.425

102.402102.402102.402

101.145101.270101.420

0.4750.6000.750

100.670100.670100.670

64h6g8g

00.0800.080

105.000104.920104.920

0.3750.6000.950

104.625104.320103.970

101.103101.023101.023

0.1900.3000.475

100.913100.723100.548

97.21797.02796.852

5H6H7H

000

105.000105.000105.000

101.418101.503101.603

0.3150.4000.500

101.103101.103101.103

99.13599.30599.505

0.6300.8001.000

98.50598.50598.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

25

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

110

24h6g8g

00.0380.038

110.000109.962109.962

0.1800.2800.450

109.820109.682109.512

108.701108.663108.663

0.1180.1900.300

108.583108.473108.363

107.351107.241107.131

5H6H7H

000

110.000110.000110.000

108.901108.951109.016

0.2000.2500.315

108.701108.701108.701

108.135108.210108.310

0.3000.3750.475

107.835107.835107.835

34h6g8g

00.0480.048

110.000109.952109.952

0.2360.3750.600

109.764109.577109.352

108.051108.003108.003

0.1400.2240.355

107.911107.779107.648

106.063105.931105.800

5H6H7H

000

110.000110.000110.000

108.287108.351108.426

0.2360.3000.375

108.051108.051108.051

107.152107.252107.382

0.4000.5000.630

106.752106.752106.752

44h6g8g

00.0600.060

110.000109.940109.940

0.3000.4750.750

109.700109.465109.190

107.402107.342107.342

0.1600.2500.400

107.242107.092106.942

104.778104.628104.478

5H6H7H

000

110.000110.000110.000

107.667107.737107.827

0.2650.3350.425

107.402107.402107.402

106.145106.270106.420

0.4750.6000.750

105.670105.670105.670

64h6g8g

00.0800.080

110.000109.920109.920

0.3750.6000.950

109.625109.320108.970

106.103106.023106.023

0.1900.3000.475

105.913105.723105.548

102.217102.027101.852

5H6H7H

000

110.000110.000110.000

106.418106.503106.603

0.3150.4000.500

106.103106.103106.103

104.135104.305104.505

0.6300.8001.000

103.505103.505103.505

115

24h6g8g

00.0380.038

115.000114.962114.962

0.1800.2800.450

114.820114.682114.512

113.701113.663113.663

0.1180.1900.300

113.583113.473113.363

112.351112.241112.131

5H6H7H

000

115.000115.000115.000

113.901113.951114.016

0.2000.2500.315

113.701113.701113.701

113.135113.210113.310

0.3000.3750.475

112.835112.835112.835

34h6g8g

00.0480.048

115.000114.952114.952

0.2360.3750.600

114.764114.577114.352

113.051113.003113.003

0.1400.2240.355

112.911112.779112.648

111.063110.931110.800

5H6H7H

000

115.000115.000115.000

113.287113.351113.426

0.2360.3000.375

113.051113.051113.051

112.152112.252112.382

0.4000.5000.630

111.752111.752111.752

44h6g8g

00.0600.060

115.00114.940114.940

0.3000.4750.750

114.700114.465114.190

112.402112.342112.342

0.1600.2500.400

112.242112.092111.942

109.778109.628109.478

5H6H7H

000

115.000115.000115.000

112.667112.737112.827

0.2650.3350.425

112.402112.402112.402

111.145111.270111.420

0.4750.6000.750

110.670110.670110.670

64h6g8g

00.0800.080

115.000114.920114.920

0.3750.6000.950

114.625114.320113.970

111.103111.023111.023

0.1900.3000.475

110.913110.723110.548

107.217107.027106.852

5H6H7H

000

115.000115.000115.000

111.418111.503111.603

0.3150.4000.500

111.103111.103111.103

109.135109.305109.505

0.6300.8001.000

108.505108.505108.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

26©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

120

24h6g8g

00.0380.038

120.000119.962119.962

0.1800.2800.450

119.820119.682119.512

118.701118.663118.663

0.1180.1900.300

118.583118.473118.363

117.351117.241117.131

5H6H7H

000

120.000120.000120.000

118.901118.951119.016

0.2000.2500.315

118.701118.701118.701

118.135118.210118.310

0.3000.3750.475

117.835117.835117.835

34h6g8g

00.0480.048

120.000119.952119.952

0.2360.3750.600

119.764119.577119.352

118.051118.003118.003

0.1400.2240.355

117.911117.779117.648

116.063115.931115.800

5H6H7H

000

120.000120.000120.000

118.287118.351118.426

0.2360.3000.375

118.051118.051118.051

117.152117.252117.382

0.4000.5000.630

116.752116.752116.752

44h6g8g

00.0600.060

120.000119.940119.940

0.3000.4750.750

119.700119.465119.190

117.402117.342117.342

0.1600.2500.400

117.242117.092116.942

114.778114.628114.478

5H6H7H

000

120.000120.000120.000

117.667117.737117.827

0.2650.3350.425

117.402117.402117.402

116.145116.270116.420

0.4750.6000.750

115.670115.670115.670

64h6g8g

00.0800.080

120.000119.920119.920

0.3750.6000.950

119.625119.320118.970

116.103116.023116.023

0.1900.3000.475

115.913115.723115.548

112.217112.027111.852

5H6H7H

000

120.000120.000120.000

116.418116.503116.603

0.3150.4000.500

116.103116.103116.103

114.135114.305114.505

0.6300.8001.000

113.505113.505113.505

125

24h6g8g

00.0380.038

125.000124.962124.962

0.1800.2800.450

124.820124.682124.512

123.701123.663123.663

0.1180.1900.300

123.583123.473123.363

122.351122.241122.131

5H6H7H

000

125.000125.000125.000

123.901123.951124.016

0.2000.2500.315

123.701123.701123.701

123.135123.210123.310

0.3000.3750.475

122.835122.835122.835

34h6g8g

00.0480.048

125.000124.952124.952

0.2360.3750.600

124.764124.577124.352

123.051123.003123.003

0.1400.2240.355

122.911122.779122.648

121.063120.931120.800

5H6H7H

000

125.000125.000125.000

123.287123.351123.426

0.2360.3000.375

123.051123.051123.051

122.152122.252122.382

0.4000.5000.630

121.752121.752121.752

44h6g8g

00.0600.060

125.000124.940124.940

0.3000.4750.750

124.700124.465124.190

122.402122.342122.342

0.1600.2500.400

122.242122.092121.942

119.778119.628119.478

5H6H7H

000

125.000125.000125.000

122.667122.737122.827

0.2650.3350.425

122.402122.402122.402

121.145121.270121.420

0.4750.6000.750

120.670120.670120.670

64h6g8g

00.0800.080

125.000124.920124.920

0.3750.6000.950

124.625124.320123.970

121.103121.023121.023

0.1900.3000.475

120.913120.723120.548

117.217117.027116.852

5H6H7H

000

125.000125.000125.000

121.418121.503121.603

0.3150.4000.500

121.103121.103121.103

119.135119.305119.505

0.6300.8001.000

118.505118.505118.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

27

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

130

24h6g8g

00.0380.038

130.000129.962129.962

0.1800.2800.450

129.820129.682129.512

128.701128.663128.663

0.1180.1900.300

128.583128.473128.363

127.351127.241127.131

5H6H7H

000

130.000130.000130.000

128.901128.951129.016

0.2000.2500.315

128.701128.701128.701

128.135128.210128.310

0.3000.3750.475

127.835127.835127.835

34h6g8g

00.0480.048

130.000129.952129.952

0.2360.3750.600

129.764129.577129.352

128.051128.003128.003

0.1400.2240.355

127.911127.779127.648

126.063125.931125.800

5H6H7H

000

130.000130.000130.000

128.287128.351128.426

0.2360.3000.375

128.051128.051128.051

127.152127.252127.382

0.4000.5000.630

126.752126.752126.752

44h6g8g

00.0600.060

130.000129.940129.940

0.3000.4750.750

129.700129.465129.190

127.402127.342127.342

0.1600.2500.400

127.242127.092126.942

124.778124.628124.478

5H6H7H

000

130.000130.000130.000

127.667127.737127.827

0.2650.3350.425

127.402127.402127.402

126.145126.270126.420

0.4750.6000.750

125.670125.670125.670

64h6g8g

00.0800.080

130.000129.920129.920

0.3750.6000.950

129.625129.320128.970

126.103126.023126.023

0.1900.3000.475

125.913125.723125.548

122.217122.027121.852

5H6H7H

000

130.000130.000130.000

126.418126.503126.603

0.3150.4000.500

126.103126.103126.103

124.135124.305124.505

0.6300.8001.000

123.505123.505123.505

135

24h6g8g

00.0380.038

135.000134.962134.962

0.1800.2800.450

134.820134.682134.512

133.701133.663133.663

0.1180.1900.300

133.583133.473133.363

132.351132.241132.131

5H6H7H

000

135.000135.000135.000

133.901133.951134.016

0.2000.2500.315

133.701133.701133.701

133.135133.210133.310

0.3000.3750.475

132.835132.835132.835

34h6g8g

00.0480.048

135.000134.952134.952

0.2360.3750.600

134.764134.577134.352

133.051133.003133.003

0.1400.2240.355

132.911132.779132.648

131.063130.931130.800

5H6H7H

000

135.000135.000135.000

133.287133.351133.426

0.2360.3000.375

133.051133.051133.051

132.152132.252132.382

0.4000.5000.630

131.752131.752131.752

44h6g8g

00.0600.060

135.000134.940134.940

0.3000.4750.750

134.700134.465134.190

132.402132.342132.342

0.1600.2500.400

132.242132.092131.942

129.778129.628129.478

5H6H7H

000

135.000135.000135.000

132.667132.737132.827

0.2650.3350.425

132.402132.402132.402

131.145131.270131.420

0.4750.6000.750

130.670130.670130.670

64h6g8g

00.0800.080

135.000134.920134.920

0.3750.6000.950

134.625134.320133.970

131.103131.023131.023

0.1900.3000.475

130.913130.723130.548

127.217127.027126.852

5H6H7H

000

135.000135.000135.000

131.418131.503131.603

0.3150.4000.500

131.103131.103131.103

129.135129.305129.505

0.6300.8001.000

128.505128.505128.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

28©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

140

24h6g8g

00.0380.038

140.000139.962139.962

0.1800.2800.450

139.820139.682139.512

138.701138.663138.663

0.1180.1900.300

138.583138.473138.363

137.351137.241137.131

5H6H7H

000

140.000140.000140.000

138.901138.951139.016

0.2000.2500.315

138.701138.701138.701

138.135138.210138.310

0.3000.3750.475

137.835137.835137.835

34h6g8g

00.0480.048

140.000139.952139.952

0.2360.3750.600

139.764139.577139.352

138.051138.003138.003

0.1400.2240.355

137.911137.779137.648

136.063135.931135.800

5H6H7H

000

140.000140.000140.000

138.287138.351138.426

0.2360.3000.375

138.051138.051138.051

137.152137.252137.382

0.4000.5000.630

136.752136.752136.752

44h6g8g

00.0600.060

140.000139.940139.940

0.3000.4750.750

139.700139.465139.190

137.402137.342137.342

0.1600.2500.400

137.242137.092136.942

134.778134.628134.478

5H6H7H

000

140.000140.000140.000

137.667137.737137.827

0.2650.3350.425

137.402137.402137.402

136.145136.270136.420

0.4750.6000.750

135.670135.670135.670

64h6g8g

00.0800.080

140.000139.920139.920

0.3750.6000.950

139.625139.320138.970

136.103136.023136.023

0.1900.3000.475

135.913135.723135.548

132.217132.027131.852

5H6H7H

000

140.000140.000140.000

136.418136.503136.603

0.3150.4000.500

136.103136.103136.103

134.135134.305134.505

0.6300.8001.000

133.505133.505133.505

145

24h6g8g

00.0380.038

145.000144.962144.962

0.1800.2800.450

144.820144.682144.512

143.701143.663143.663

0.1180.1900.300

143.583143.473143.363

142.351142.241142.131

5H6H7H

000

145.000145.000145.000

143.901143.951144.016

0.2000.2500.315

143.701143.701143.701

143.135143.210143.310

0.3000.3750.475

142.835142.835142.835

34h6g8g

00.0480.048

145.000144.952144.952

0.2360.3750.600

144.764144.577144.352

143.051143.003143.003

0.1400.2240.355

142.911142.779142.648

141.063140.931140.800

5H6H7H

000

145.000145.000145.000

143.287143.351143.426

0.2360.3000.375

143.051143.051143.051

142.152142.252142.382

0.4000.5000.630

141.752141.752141.752

44h6g8g

00.0600.060

145.000144.940144.940

0.3000.4750.750

144.700144.465144.190

142.402142.342142.342

0.1600.2500.400

142.242142.092141.942

139.778139.628139.478

5H6H7H

000

145.000145.000145.000

142.667142.737142.827

0.2650.3350.425

142.402142.402142.402

141.145141.270141.420

0.4750.6000.750

140.670140.670140.670

64h6g8g

00.0800.080

145.000144.920144.920

0.3750.6000.950

144.625144.320143.970

141.103141.023141.023

0.1900.3000.475

140.913140.723140.548

137.217137.027136.852

5H6H7H

000

145.000145.000145.000

141.418141.503141.603

0.3150.4000.500

141.103141.103141.103

139.135139.305139.505

0.6300.8001.000

138.505138.505138.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

29

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

150

24h6g8g

00.0380.038

150.000149.962149.962

0.1800.2800.450

149.820149.682149.512

148.701148.663148.663

0.1180.1900.300

148.583148.473148.363

147.351147.241147.131

5H6H7H

000

150.000150.000150.000

148.901148.951149.016

0.2000.2500.315

148.701148.701148.701

148.135148.210148.310

0.3000.3750.475

147.835147.835147.835

34h6g8g

00.0480.048

150.000149.952149.952

0.2360.3750.600

149.764149.577149.352

148.051148.003148.003

0.1400.2240.355

147.911147.779147.648

146.063145.931145.800

5H6H7H

000

150.000150.000150.000

148.287148.351148.426

0.2360.3000.375

148.051148.051148.051

147.152147.252147.382

0.4000.5000.630

146.752146.752146.752

44h6g8g

00.0600.060

150.000149.940149.940

0.3000.4750.750

149.700149.465149.190

147.402147.342147.342

0.1600.2500.400

147.242147.092146.942

144.778144.628144.478

5H6H7H

000

150.000150.000150.000

147.667147.737147.827

0.2650.3350.425

147.402147.402147.402

146.145146.270146.420

0.4750.6000.750

145.670145.670145.670

64h6g8g

00.0800.080

150.000149.920149.920

0.3750.6000.950

149.625149.320148.970

146.103146.023146.023

0.1900.3000.475

145.913145.723145.548

142.217142.027141.852

5H6H7H

000

150.000150.000150.000

146.418146.503146.603

0.3150.4000.500

146.103146.103146.103

144.135144.305144.505

0.6300.8001.000

143.505143.505143.505

155

34h6g8g

00.0480.048

155.000154.952154.952

0.2360.3750.600

154.764154.577154.352

153.051153.003153.003

0.1400.2240.355

152.911152.779152.648

151.063150.931150.800

5H6H7H

000

155.000155.000155.000

153.287153.351153.426

0.2360.3000.375

153.051153.051153.051

152.152152.252152.382

0.4000.5000.630

151.752151.752151.752

44h6g8g

00.0600.060

155.000154.940154.940

0.3000.4750.750

154.700154.465154.190

152.402152.342152.342

0.1600.2500.400

152.242152.092151.942

149.778149.628149.478

5H6H7H

000

155.000155.000155.000

152.667152.737152.827

0.2650.3350.425

152.402152.402152.402

151.145151.270151.420

0.4750.6000.750

150.670150.670150.670

64h6g8g

00.0800.080

155.000154.920154.920

0.3750.6000.950

154.625154.320153.970

151.103151.023151.023

0.1900.3000.475

150.913150.723150.548

147.217147.027146.852

5H6H7H

000

155.000155.000155.000

151.418151.503151.603

0.3150.4000.500

151.103151.103151.103

149.135149.305149.505

0.6300.8001.000

148.505148.505148.505

160

34h6g8g

00.0480.048

160.000159.952159.952

0.2360.3750.600

159.764159.577159.352

158.051158.003158.003

0.1400.2240.355

157.911157.779157.648

156.063155.931155.800

5H6H7H

000

160.000160.000160.000

158.287158.351158.426

0.2360.3000.375

158.051158.051158.051

157.152157.252157.382

0.4000.5000.630

156.752156.752156.752

44h6g8g

00.0600.060

160.000159.940159.940

0.3000.4750.750

159.700159.465159.190

157.402157.342157.342

0.1600.2500.400

157.242157.092156.942

154.778154.628154.478

5H6H7H

000

160.000160.000160.000

157.667157.737157.827

0.2650.3350.425

157.402157.402157.402

156.145156.270156.420

0.4750.6000.750

155.670155.670155.670

64h6g8g

00.0800.080

160.000159.920159.920

0.3750.6000.950

159.625159.320158.970

156.103156.023156.023

0.1900.3000.475

155.913155.723155.548

152.217152.027151.852

5H6H7H

000

160.000160.000160.000

156.418156.503156.603

0.3150.4000.500

156.103156.103156.103

154.135154.305154.505

0.6300.8001.000

153.505153.505153.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

30©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

165

34h6g8g

00.0480.048

165.000164.952164.952

0.2360.3750.600

164.764164.577164.352

163.051163.003163.003

0.1400.2240.355

162.911162.779162.648

161.063160.931160.800

5H6H7H

000

165.000165.000165.000

163.287163.351163.426

0.2360.3000.375

163.051163.051163.051

162.152162.252162.382

0.4000.5000.630

161.752161.752161.752

44h6g8g

00.0600.060

165.000164.940164.940

0.3000.4750.750

164.700164.465164.190

162.402162.342162.342

0.1600.2500.400

162.242162.092161.942

159.778159.628159.478

5H6H7H

000

165.000165.000165.000

162.667162.737162.827

0.2650.3350.425

162.402162.402162.402

161.145161.270161.420

0.4750.6000.750

160.670160.670160.670

64h6g8g

00.0800.080

165.000164.920164.920

0.3750.6000.950

164.625164.320163.970

161.103161.023161.023

0.1900.3000.475

160.913160.723160.548

157.217157.027156.852

5H6H7H

000

165.000165.000165.000

161.418161.503161.603

0.3150.4000.500

161.103161.103161.103

159.135159.305159.505

0.6300.8001.000

158.505158.505158.505

170

34h6g8g

00.0480.048

170.000169.952169.952

0.2360.3750.600

169.764169.577169.352

168.051168.003168.003

0.1400.2240.355

167.911167.779167.648

166.063165.931165.800

5H6H7H

000

170.000170.000170.000

168.287168.351168.426

0.2360.3000.375

168.051168.051168.051

167.152167.252167.382

0.4000.5000.630

166.752166.752166.752

44h6g8g

00.0600.060

170.000169.940169.940

0.3000.4750.750

169.700169.465169.190

167.402167.342167.342

0.1600.2500.400

167.242167.092166.942

164.778164.628164.478

5H6H7H

000

170.000170.000170.000

167.667167.737167.827

0.2650.3350.425

167.402167.042167.402

166.145166.270166.420

0.4750.6000.750

165.670165.670165.670

64h6g8g

00.0800.080

170.000169.920169.920

0.3750.6000.950

169.625169.320168.970

166.103166.023166.023

0.1900.3000.475

165.913165.723165.548

162.217162.027161.852

5H6H7H

000

170.000170.000170.000

166.418166.503166.603

0.3150.4000.500

166.103166.103166.103

164.135164.305164.505

0.6300.8001.000

163.505163.505163.505

175

34h6g8g

00.0480.048

175.000174.952174.952

0.2360.3750.600

174.764174.577174.352

173.051173.003173.003

0.1400.2240.355

172.911172.779172.648

171.063170.931170.800

5H6H7H

000

175.000175.000175.000

173.287173.351173.426

0.2360.3000.375

173.051173.051173.051

172.152172.252172.382

0.4000.5000.630

171.752171.752171.752

44h6g8g

00.0600.060

175.000174.940174.940

0.3000.4750.750

174.700174.465174.190

172.402172.342172.342

0.1600.2500.400

172.242172.092171.942

169.778169.628169.478

5H6H7H

000

175.000175.000175.000

172.667172.737172.827

0.2650.3350.425

172.402172.402172.402

171.145171.270171.420

0.4750.6000.750

170.670170.670170.670

64h6g8g

00.0800.080

175.000174.920174.920

0.3750.6000.950

174.625174.320173.970

171.103171.023171.023

0.1900.3000.475

170.913170.723170.548

167.217167.027166.852

5H6H7H

000

175.000175.000175.000

171.418171.503171.603

0.3150.4000.500

171.103171.103171.103

169.135169.305169.505

0.6300.8001.000

168.505168.505168.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

31

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

180

34h6g8g

00.0480.048

180.000179.952179.952

0.2360.3750.600

179.764179.577179.352

178.051178.003178.003

0.1400.2240.355

177.911177.779177.648

176.063175.931175.800

5H6H7H

000

180.000180.000180.000

178.287178.351178.426

0.2360.3000.375

178.051178.051178.051

177.152177.252177.382

0.4000.5000.630

176.752176.752176.752

44h6g8g

00.0600.060

180.000179.940179.940

0.3000.4750.750

179.700179.475179.190

177.402177.342177.342

0.1600.2500.400

177.242177.092176.942

174.778174.628174.478

5H6H7H

000

180.000180.000180.000

177.667177.737177.827

0.2650.3350.425

177.402177.402177.402

176.145176.270176.420

0.4750.6000.750

175.670175.670175.670

64h6g8g

00.0800.080

180.000179.920179.920

0.3750.6000.950

179.625179.320178.970

176.103176.023176.023

0.1900.3000.475

175.913175.723175.548

172.217172.027171.852

5H6H7H

000

180.000180.000180.000

176.418176.503176.603

0.3150.4000.500

176.103176.103176.103

174.135174.305174.505

0.6300.8001.000

173.505173.505173.505

185

34h6g8g

00.0480.048

185.000184.952184.952

0.2360.3750.600

184.764184.577184.352

183.051183.003183.003

0.1600.2500.400

182.891182.753182.603

181.043180.905180.755

5H6H7H

000

185.000185.000185.000

183.316183.386183.476

0.2650.3350.425

183.051183.051183.051

182.152182.252182.382

0.4000.5000.630

181.752181.752181.752

44h6g8g

00.0600.060

185.000184.940184.940

0.3000.4750.750

184.700184.465184.190

182.402182.342182.342

0.1800.2800.450

182.222182.062181.892

179.758179.598179.428

5H6H7H

000

185.000185.000185.000

182.702182.777182.877

0.3000.3750.475

182.402182.402182.402

181.145181.270181.420

0.4750.6000.750

180.670180.670180.670

64h6g8g

00.0800.080

185.000184.920184.920

0.3750.6000.950

184.625184.320183.970

181.103181.023181.023

0.2000.3150.500

180.903180.708180.523

177.207177.012176.827

5H6H7H

000

185.000185.000185.000

181.438181.528181.633

0.3350.4250.530

181.103181.103181.103

179.135179.305179.505

0.6300.8001.000

178.505178.505178.505

190

34h6g8g

00.0480.048

190.000189.952189.952

0.2360.3750.600

189.764189.577189.352

188.051188.003188.003

0.1600.2500.400

187.891187.753187.603

186.043185.905185.755

5H6H7H

000

190.000190.000190.000

188.316188.386188.476

0.2650.3350.425

188.051188.051188.051

187.152187.252187.382

0.4000.5000.630

186.752186.752186.752

44h6g8g

00.0600.060

190.000189.940189.940

0.3000.4750.750

189.700189.465189.190

187.402187.342187.342

0.1800.2800.450

187.222187.062186.892

184.758184.598184.428

5H6H7H

000

190.000190.000190.000

187.702187.777187.877

0.3000.3750.475

187.402187.402187.402

186.145186.270186.420

0.4750.6000.750

185.670185.670185.670

64h6g8g

00.0800.080

190.000189.920189.920

0.3750.6000.950

189.625189.320189.970

186.103186.023186.023

0.2000.3150.500

185.903185.708185.523

182.207182.012181.827

5H6H7H

000

190.000190.000190.000

186.438186.528186.633

0.3350.4250.530

186.103186.103186.103

184.135184.305184.505

0.6300.8001.000

183.505183.505183.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

32©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

195

34h6g8g

00.0480.048

195.000194.952194.952

0.2360.3750.600

194.764194.577194.352

193.051193.003193.003

0.1600.2500.400

192.891192.753192.603

191.043190.905190.755

5H6H7H

000

195.000195.000195.000

193.316193.386193.476

0.2650.3350.425

193.051193.051193.051

192.152192.252192.382

0.4000.5000.630

191.752191.752191.752

44h6g8g

00.0600.060

195.000194.940194.940

0.3000.4750.750

194.700194.465194.190

192.402192.342192.342

0.1800.2800.450

192.222192.062191.892

189.758189.598189.428

5H6H7H

000

195.000195.000195.000

192.702192.777192.877

0.3000.3750.475

192.402192.402192.402

191.145191.270191.420

0.4750.6000.750

190.670190.670190.670

64h6g8g

00.0800.080

195.000194.920194.920

0.3750.6000.950

194.625194.320193.970

191.103191.023191.023

0.2000.3150.500

190.903190.708190.523

187.207187.012186.827

5H6H7H

000

195.000195.000195.000

191.438191.528191.633

0.3350.4250.530

191.103191.103191.103

189.135189.305189.505

0.6300.8001.000

188.505188.505188.505

200

34h6g8g

00.0480.048

200.000199.952199.952

0.2360.3750.600

199.764199.577199.352

198.051198.003198.003

0.1600.2500.400

197.891197.753197.603

196.043195.905195.755

5H6H7H

000

200.000200.000200.000

198.316198.386198.476

0.2650.3350.425

198.051198.051198.051

197.152197.252197.382

0.4000.5000.630

196.752196.752196.752

44h6g8g

00.0600.060

200.000199.940199.940

0.3000.4750.750

199.700199.465199.190

197.402197.342197.342

0.1800.2800.450

197.222197.062196.892

194.758194.598194.428

5H6H7H

000

200.000200.000200.000

197.702197.777197.877

0.3000.3750.475

197.402197.402197.402

196.145196.270196.420

0.4750.6000.750

195.670195.670195.670

64h6g8g

00.0800.080

200.000199.920199.920

0.3750.6000.950

199.625199.320198.970

196.103196.023196.023

0.2000.3150.500

195.903195.708195.523

192.207192.012191.827

5H6H7H

000

200.000200.000200.000

196.438196.528196.633

0.3350.4250.530

196.103196.103196.103

194.135194.305194.505

0.6300.8001.000

193.505193.505193.505

205

34h6g8g

00.0480.048

205.000204.952204.952

0.2360.3750.600

204.764204.577204.352

203.051203.003203.003

0.1600.2500.400

202.891202.753202.603

201.043200.905200.755

5H6H7H

000

205.000205.000205.000

203.316203.386203.476

0.2650.3350.425

203.051203.051203.051

202.152202.252202.382

0.4000.5000.630

201.752201.752201.752

44h6g8g

00.0600.060

205.000204.940204.940

0.3000.4750.750

204.700204.465204.190

202.402202.342202.342

0.1800.2800.450

202.222202.062201.892

199.758199.598199.428

5H6H7H

000

205.000205.000205.000

202.702202.777202.877

0.3000.3750.475

202.402202.402202.402

201.145201.270201.420

0.4750.6000.750

200.670200.670200.670

64h6g8g

00.0800.080

205.000204.920204.920

0.3750.6000.950

204.625204.320203.970

201.103201.023201.023

0.2000.3150.500

200.903200.708200.523

197.207197.012196.827

5H6H7H

000

205.000205.000205.000

201.438201.528201.633

0.3350.4250.530

201.103201.103201.103

199.135199.305199.505

0.6300.8001.000

198.505198.505198.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

33

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

210

34h6g8g

00.0480.048

210.000209.952209.952

0.2360.3750.600

209.764209.577209.352

208.051208.003208.003

0.1600.2500.400

207.891207.753207.603

206.043205.905205.755

5H6H7H

000

210.000210.000210.000

208.316208.386208.476

0.2650.3350.425

208.051208.051208.051

207.152207.252207.382

0.4000.5000.630

206.752206.752206.752

44h6g8g

00.0600.060

210.000209.940209.940

0.3000.4750.750

209.700209.465209.190

207.402207.342207.342

0.1800.2800.450

207.222207.062206.892

204.758204.598204.428

5H6H7H

000

210.000210.000210.000

207.702207.777207.877

0.3000.3750.475

207.402207.402207.402

206.145206.270206.420

0.4750.6000.750

205.670205.670205.670

64h6g8g

00.0800.080

210.000209.920209.920

0.3750.6000.950

209.625209.320208.970

206.103206.023206.023

0.2000.3150.500

205.903205.708205.523

202.207202.012201.827

5H6H7H

000

210.000210.000210.000

206.438206.528206.633

0.3350.4250.530

206.103206.103206.103

204.135204.305204.505

0.6300.8001.000

203.505203.505203.505

215

34h6g8g

00.0480.048

215.000214.952214.952

0.2360.3750.600

214.764214.577214.352

213.051213.003213.003

0.1600.2500.400

212.891212.753212.603

211.043210.905210.755

5H6H7H

000

215.000215.000215.000

213.316213.386213.476

0.2650.3350.425

213.051213.051213.051

212.152212.252212.382

0.4000.5000.630

211.752211.752211.752

44h6g8g

00.0600.060

215.000214.940214.940

0.3000.4750.750

214.700214.465214.190

212.402212.342212.342

0.1800.2800.450

212.222212.062211.892

209.758209.598209.428

5H6H7H

000

215.000215.000215.000

212.702212.777212.877

0.3000.3750.475

212.402212.402212.402

211.145211.270211.420

0.4750.6000.750

210.670210.670210.670

64h6g8g

00.0800.080

215.000214.920214.920

0.3750.6000.950

214.625214.320213.970

211.103211.023211.023

0.2000.3150.500

210.903210.708210.523

207.207207.012206.827

5H6H7H

000

215.000215.000215.000

211.438211.528211.633

0.3350.4250.530

211.103211.103211.103

209.135209.305209.505

0.6300.8001.000

208.505208.505208.505

220

34h6g8g

00.0480.048

220.000219.952219.952

0.2360.3750.600

219.764219.577219.352

218.051218.003218.003

0.1600.2500.400

217.891217.753217.603

216.043215.905215.755

5H6H7H

000

220.000220.000220.000

218.316218.386218.476

0.2650.3350.425

218.051218.051218.051

217.152217.252217.382

0.4000.5000.630

216.752216.752216.752

44h6g8g

00.0600.060

220.000219.940219.940

0.3000.4750.750

219.700219.465219.190

217.402217.342217.342

0.1800.2800.450

217.222217.062216.892

214.758214.598214.428

5H6H7H

000

220.000220.000220.000

217.702217.777217.877

0.3000.3750.475

217.402217.402217.402

216.145216.270216.420

0.4750.6000.750

215.670215.670215.670

64h6g8g

00.0800.080

220.000219.920219.920

0.3750.6000.950

219.625219.320218.970

216.103216.023216.023

0.2000.3150.500

215.903215.708215.523

212.207212.012211.827

5H6H7H

000

220.000220.000220.000

216.438216.528216.633

0.3350.4250.530

216.103216.103216.103

214.135214.305214.505

0.6300.8001.000

213.505213.505213.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

34©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

225

34h6g8g

00.0480.048

225.000224.952224.952

0.2360.3750.600

224.764224.577224.352

223.051223.003223.003

0.1600.2500.400

222.891222.753222.603

221.043220.905220.755

5H6H7H

000

225.000225.000225.000

223.316223.386223.476

0.2650.3350.425

223.051223.051223.051

222.152222.252222.382

0.4000.5000.630

221.752221.752221.752

44h6g8g

00.0600.060

225.000224.940224.940

0.3000.4750.750

224.700224.465224.190

222.402222.342222.342

0.1800.2800.450

222.222222.062221.892

219.758219.598219.428

5H6H7H

000

225.000225.000225.000

222.702222.777222.877

0.3000.3750.475

222.402222.402222.402

221.145221.270221.420

0.4750.6000.750

220.670220.670220.670

64h6g8g

00.0800.080

225.000224.920224.920

0.3750.6000.950

224.625224.320223.970

224.103224.023223.023

0.2000.3150.500

220.903220.708220.523

217.207217.012216.827

5H6H7H

000

225.000225.000225.000

221.438221.528221.633

0.3350.4250.530

221.103221.103221.103

219.135219.305219.505

0.6300.8001.000

218.505218.505218.505

230

34h6g8g

00.0480.048

230.000229.952229.952

0.2360.3750.600

229.764229.577229.352

228.051228.003228.003

0.1600.2500.400

227.891227.753227.603

226.043225.905225.755

5H6H7H

000

230.000230.000230.000

228.316228.386228.476

0.2650.3350.425

228.051228.051228.051

227.152227.252227.382

0.4000.5000.630

226.752226.752226.752

44h6g8g

00.0600.060

230.000229.940229.940

0.3000.4750.750

229.700229.465229.190

227.402227.342227.342

0.1800.2800.450

227.222227.062226.892

224.758224.598224.428

5H6H7H

000

230.000230.000230.000

227.702227.777227.877

0.3000.3750.475

227.402227.402227.402

226.145226.270226.420

0.4750.6000.750

225.670225.670225.670

64h6g8g

00.0800.080

230.000229.920229.920

0.3750.6000.950

229.625229.320228.970

226.103226.023226.023

0.2000.3150.500

225.903225.708225.523

222.207222.012221.827

5H6H7H

000

230.000230.000230.000

226.438226.528226.633

0.3350.4250.530

226.103226.103226.103

224.135224.305224.505

0.6300.8001.000

223.505223.505223.505

235

34h6g8g

00.0480.048

235.000234.952234.952

0.2360.3750.600

234.764234.577234.352

233.051233.003233.003

0.1600.2500.400

232.891232.753232.603

231.043230.905230.755

5H6H7H

000

235.000235.000235.000

233.316233.386233.476

0.2650.3350.425

233.051233.051233.051

232.152232.252232.382

0.4000.5000.630

231.752231.752231.752

44h6g8g

00.0600.060

235.000234.940234.940

0.3000.4750.750

234.700234.465234.190

232.402232.342232.342

0.1800.2800.450

232.222232.062231.892

229.758229.598229.428

5H6H7H

000

235.000235.000235.000

232.702232.777232.877

0.3000.3750.475

232.402232.402232.402

231.145231.270231.420

0.4750.6000.750

230.670230.670230.670

64h6g8g

00.0800.080

235.000234.920234.920

0.3750.6000.950

234.625234.320233.970

231.103231.023231.023

0.2000.3150.500

230.903230.708230.523

227.207227.012226.827

5H6H7H

000

235.000235.000235.000

231.438231.528231.633

0.3350.4250.530

231.103231.103231.103

229.135229.305229.505

0.6300.8001.000

228.505228.505228.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

35

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

240

34h6g8g

00.0480.048

240.000239.952239.952

0.2360.3750.600

239.764239.577239.352

238.051238.003238.003

0.1600.2500.400

237.891237.753237.603

236.043235.905235.755

5H6H7H

000

240.000240.000240.000

238.316238.386238.476

0.2650.3350.425

238.051238.051238.051

237.152237.252237.382

0.4000.5000.630

236.752236.752236.752

44h6g8g

00.0600.060

240.000239.940239.940

0.3000.4750.750

239.700239.465239.190

237.402237.342237.342

0.1800.2800.450

237.222237.062236.892

234.758234.598234.428

5H6H7H

000

240.000240.000240.000

237.702237.777237.877

0.3000.3750.475

237.402237.402237.402

236.145236.270236.420

0.4750.6000.750

235.670235.670235.670

64h6g8g

00.0800.080

240.000239.920239.920

0.3750.6000.950

239.625239.320238.970

236.103236.023236.023

0.2000.3150.500

235.903235.708235.523

232.207232.012231.827

5H6H7H

000

240.000240.000240.000

236.438236.528236.633

0.3350.4250.530

236.103236.103236.103

234.135234.305234.505

0.6300.8001.000

233.505233.505233.505

245

34h6g8g

00.0480.048

245.000244.952244.952

0.2360.3750.600

244.764244.577244.352

243.051243.003243.003

0.1600.2500.400

242.891242.753242.603

241.043240.905240.755

5H6H7H

000

245.000245.000245.000

243.316243.386243.476

0.2650.3350.425

243.051243.051243.051

242.152242.252242.382

0.4000.5000.630

241.752241.752241.752

44h6g8g

00.0600.060

245.000244.940244.940

0.3000.4750.750

244.700244.465244.190

242.402242.342242.342

0.1800.2800.450

242.222242.062241.892

239.758239.598239.428

5H6H7H

000

245.000245.000245.000

242.702242.777242.877

0.3000.3750.475

242.402242.402242.402

241.145241.270241.420

0.4750.6000.750

240.670240.670240.670

64h6g8g

00.0800.080

245.000244.920244.920

0.3750.6000.950

244.625244.320243.970

241.103241.023241.023

0.2000.3150.500

240.903240.708240.523

237.207237.012236.827

5H6H7H

000

245.000245.000245.000

241.438241.528241.633

0.3350.4250.530

241.103241.103241.103

239.135239.305239.505

0.6300.8001.000

238.505238.505238.505

250

34h6g8g

00.0480.048

250.000249.952249.952

0.2360.3750.600

249.764249.577249.352

248.051248.003248.003

0.1600.2500.400

247.891247.753247.603

246.043245.905245.755

5H6H7H

000

250.000250.000250.000

248.316248.386248.476

0.2650.3350.425

248.051248.051248.051

247.152247.252247.382

0.4000.5000.630

246.752246.752246.752

44h6g8g

00.0600.060

250.000249.940249.940

0.3000.4750.750

249.700249.465249.190

247.402247.342247.342

0.1800.2800.450

247.222247.062247.892

244.758244.598244.428

5H6H7H

000

250.000250.000250.000

247.702247.777247.877

0.3000.3750.475

247.402247.402247.402

246.145246.270246.420

0.4750.6000.750

245.670245.670245.670

64h6g8g

00.0800.080

250.000249.920249.920

0.3750.6000.950

249.625249.320248.970

246.103246.023246.023

0.2000.3150.500

245.903245.708245.523

242.207242.012241.827

5H6H7H

000

250.000250.000250.000

246.438246.528246.633

0.3350.4250.530

246.103246.103246.103

244.135244.305244.505

0.6300.8001.000

243.505243.505243.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

36©

BS

I 12-1998

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

255

44h6g8g

00.0600.060

255.000254.940254.940

0.3000.4750.750

254.700254.465254.190

252.402252.342252.342

0.1800.2800.450

252.222252.062251.892

249.758249.598249.428

5H6H7H

000

255.000255.000255.000

252.702252.777252.877

0.3000.3750.475

252.402252.402252.402

251.145251.270251.420

0.4750.6000.750

250.670250.670250.670

64h6g8g

00.0800.080

255.000254.920254.920

0.3750.6000.950

254.625254.320253.970

251.103251.023251.023

0.2000.3150.500

250.903250.708250.523

247.207247.012246.827

5H6H7H

000

255.000255.000255.000

251.438251.528251.633

0.3350.4250.530

251.103251.103251.103

249.135249.305249.505

0.6300.8001.000

248.505248.505248.505

260

44h6g8g

00.0600.060

260.000259.940259.940

0.3000.4750.750

259.700259.465259.190

257.402257.342257.342

0.1800.2800.450

257.222257.062256.892

254.758254.598254.428

5H6H7H

000

260.000260.000260.000

257.702257.777257.877

0.3000.3750.475

257.402257.402257.402

256.145256.270256.420

0.4750.6000.750

255.670255.670255.670

64h6g8g

00.0800.080

260.000259.920259.920

0.3750.6000.950

259.625259.320258.970

256.103256.023256.023

0.2000.3150.500

255.903255.708255.523

252.207252.012251.827

5H6H7H

000

260.000260.000260.000

256.438256.528256.633

0.3350.4250.530

256.103256.103256.103

254.135254.305254.505

0.6300.8001.000

253.505253.505253.505

265

44h6g8g

00.0600.060

265.000264.940264.940

0.3000.4750.750

264.700264.465264.190

262.402262.342262.342

0.1800.2800.450

262.222262.062261.892

259.758259.598259.428

5H6H7H

000

265.000265.000265.000

262.702262.777262.877

0.3000.3750.475

262.402262.402262.402

261.145261.270261.420

0.4750.6000.750

260.670260.670260.670

64h6g8g

00.0800.080

265.000264.920264.920

0.3750.6000.950

264.625264.320263.970

261.103261.023261.023

0.2000.3150.500

260.903260.708260.523

257.207257.012256.827

5H6H7H

000

265.000265.000265.000

261.438261.528261.633

0.3350.4250.530

261.103261.103261.103

259.135259.305259.505

0.6300.8001.000

258.505258.505258.505

270

44h6g8g

00.0600.060

270.000269.940269.940

0.3000.4750.750

269.700269.465269.190

267.402267.342267.342

0.1800.2800.450

267.222267.062266.892

264.758264.598264.428

5H6H7H

000

270.000270.000270.000

267.702267.777267.877

0.3000.3750.475

267.402267.402267.402

266.145266.270266.420

0.4750.6000.750

265.670265.670265.670

64h6g8g

00.0800.080

270.000269.920269.920

0.3750.6000.950

269.625269.320268.970

266.103266.023266.023

0.2000.3150.500

265.903265.708265.523

262.207262.012261.827

5H6H7H

000

270.000270.000270.000

266.438266.528266.633

0.3350.4250.530

266.103266.103266.103

264.135264.305264.505

0.6300.8001.000

263.505263.505263.505

275

44h6g8g

00.0600.060

275.000274.940274.940

0.3000.4750.750

274.700274.465274.190

272.402272.342272.342

0.1800.2800.450

272.222272.062271.892

269.758269.598269.428

5H6H7H

000

275.000275.000275.000

272.702272.777272.877

0.3000.3750.475

272.402272.402272.402

271.145271.270271.420

0.4750.6000.750

270.670270.670270.670

64h6g8g

00.0800.080

275.000274.920274.920

0.3750.6000.950

274.625274.320273.970

271.103271.023271.023

0.2000.3150.500

270.903270.708270.523

267.207267.012266.827

5H6H7H

000

275.000275.000275.000

271.438271.528271.633

0.3350.4250.530

271.103271.103271.103

269.135269.305269.505

0.6300.8001.000

268.505268.505268.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

37

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

280

44h6g8g

00.0600.060

280.000279.940279.940

0.3000.4750.750

279.700279.465279.190

277.402277.342277.342

0.1800.2800.450

277.222277.062276.892

274.758274.598274.428

5H6H7H

000

280.000280.000280.000

277.702277.777277.877

0.3000.3750.475

277.402277.402277.402

276.145276.270276.420

0.4750.6000.750

275.670275.670275.670

64h6g8g

00.0800.080

280.000279.920279.920

0.3750.6000.950

279.625279.320278.970

276.103276.023276.023

0.2000.3150.500

275.903275.708275.523

272.207272.012271.827

5H6H7H

000

280.000280.000280.000

276.438276.528276.633

0.3350.4250.530

276.103276.103276.103

274.135274.305274.505

0.6300.8001.000

273.505273.505273.505

285

44h6g8g

00.0600.060

285.000284.940284.940

0.3000.4750.750

284.700284.465284.190

282.402282.342282.342

0.1800.2800.450

282.222282.062281.892

279.758279.598279.428

5H6H7H

000

285.000285.000285.000

282.702282.777282.877

0.3000.3750.475

282.402282.402282.402

281.145281.270281.420

0.4750.6000.750

280.670280.670280.670

64h6g8g

00.0800.080

285.000284.920284.920

0.3750.6000.950

284.625284.320283.970

281.103281.023281.023

0.2000.3150.500

280.903280.708280.523

277.207277.012276.827

5H6H7H

000

285.000285.000285.000

281.438281.528281.633

0.3350.4250.530

281.103281.103281.103

279.135279.305279.505

0.6300.8001.000

278.505278.505278.505

290

44h6g8g

00.0600.060

290.000289.940289.940

0.3000.4750.750

289.700289.465289.190

287.402287.342287.342

0.1800.2800.450

287.222287.062286.892

284.758284.598284.428

5H6H7H

000

290.000290.000290.000

287.702287.777287.877

0.3000.3750.475

287.402287.402287.402

286.145286.270286.420

0.4750.6000.750

285.670285.670285.670

64h6g8g

00.0800.080

290.000289.920289.920

0.3750.6000.950

289.625289.320288.970

286.103286.023286.023

0.2000.3150.500

285.903285.708285.523

282.207282.012281.827

5H6H7H

000

290.000290.000290.000

286.438286.528286.633

0.3350.4250.530

286.103286.103286.103

284.135284.305284.505

0.6300.8001.000

283.505283.505283.505

295

44h6g8g

00.0600.060

295.000294.940294.940

0.3000.4750.750

294.700294.465294.190

292.402292.342292.342

0.1800.2800.450

292.222292.062291.892

289.758289.598289.428

5H6H7H

000

295.000295.000295.000

292.702292.777292.877

0.3000.3750.475

292.402292.402292.402

291.145291.270291.420

0.4750.6000.750

290.670290.670290.670

64h6g8g

00.0800.080

295.000294.920294.920

0.3750.6000.950

294.625294.320263.970

291.103291.023291.023

0.2000.3150.500

290.903290.708290.523

287.207287.012286.827

5H6H7H

000

295.000295.000295.000

291.438291.528291.633

0.3350.4250.530

291.103291.103291.103

289.135289.305289.505

0.6300.8001.000

288.505288.505288.505

300

44h6g8g

00.0600.060

300.000299.940299.940

0.3000.4750.750

299.700299.465299.190

297.402297.342297.342

0.1800.2800.450

297.222297.062296.892

294.758294.598294.428

5H6H7H

000

300.000300.000300.000

297.702297.777297.877

0.3000.3750.475

297.402297.402297.402

296.145296.270296.420

0.4750.6000.750

295.670295.670295.670

64h6g8g

00.0800.080

300.000299.920299.920

0.3750.6000.950

299.625299.320298.970

296.103296.023296.023

0.2000.3150.500

295.903295.708295.523

292.207292.012291.827

5H6H7H

000

300.000300.000300.000

296.438296.528296.633

0.3350.4250.530

296.103296.103296.103

294.135294.305294.505

0.6300.8001.000

293.505293.505293.505

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

38©

BS

I 12-1998

Appendix A Additional tolerance classes for aerospace useThe diameter/pitch combinations for tolerance classes 4H, 6h and 4g given in Table 2 are primarily for aerospace use.

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

© B

SI 12-1998

39

Table 2 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement for aerospace use

NOTE For the minor diameter of external threads this table specifies the minimum dimensions only. The maximum dimensions have not been specified based on the requirements of 6.10 of BS 3643-1:1981 that these dimensions are controlled by the Go gauge.

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

1.6 0.35 6h4g

00.019

1.6001.581

0.0850.053

1.5151.528

1.3731.354

0.0630.040

1.3101.314

1.0941.098

4H

2 0.4 6h4g

00.019

2.0001.981

0.0950.060

1.9051.921

1.7401.721

0.0670.042

1.6731.679

1.4271.433

4HSee Table 1

2.5 0.45 6h4g

00.020

2.5002.480

0.1000.063

2.4002.417

2.2082.188

0.0710.045

2.1372.143

1.8591.865

4H

3 0.5 6h4g

00.020

3.0002.980

0.1060.067

2.8942.913

2.6752.655

0.0750.048

2.6002.607

2.2922.299

4H 0 3.000 2.738 0.063 2.675 2.549 0.090 2.459

4 0.7 6h4g

00.022

4.0003.978

0.1400.090

3.8603.888

3.5453.523

0.0900.056

3.4553.467

3.0243.036

4H 0 4.000 3.620 0.075 3.545 3.354 0.112 3.242

5 0.8 6h4g

00.024

5.0004.976

0.1500.095

4.8504.881

4.4804.456

0.0950.060

4.3854.396

3.8923.903

4H 0 5.000 4.560 0.080 4.480 4.259 0.125 4.134

6 1 6h4g

00.026

6.0005.974

0.1800.112

5.8205.863

5.3505.324

0.1120.071

5.2385.253

4.6224.637

4H 0 6.000 5.445 0.095 5.350 5.067 0.150 4.917

8 1.25 6h4g

00.028

8.0007.972

0.2120.132

7.7887.840

7.1887.160

0.1180.075

7.0707.085

6.3006.315

4H 0 8.000 7.288 0.100 7.188 6.817 0.170 6.647

10 1.5 6h4g

00.032

10.0009.968

0.2360.150

9.7649.818

9.0268.994

0.1320.085

8.8948.909

7.9707.985

4H 0 10.00 9.138 0.112 9.026 8.566 0.190 8.376

12 1.5 6h4g

00.032

12.00011.968

0.2360.150

11.76411.818

11.02610.994

0.1400.090

10.88610.904

9.9629.980

4H 0 12.000 11.144 0.118 11.026 10.566 0.190 10.376

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS

3643-2:1981

40©

BS

I 12-1998

Table 2 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement for aerospace use

All dimensions are in millimetres.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Nominal diameter

Pitch External threads (bolts) Internal threads (nuts)

Coarse Fine Constant Tolerance class

Fund dev.

Major diameter Pitch diameter Minor diameter

Tolerance class

Fund dev.

Major diameter

Pitch diameter Minor diameter

max. tol. min. max. tol. min. min. min. max. tol. min. max. tol. min.

14 1.5 6h4g

00.032

14.00013.968

0.2360.150

13.76413.818

13.02612.994

0.1400.090

12.88612.904

11.96211.980

16 1.5 6h4g

00.032

16.00015.968

0.2360.150

15.76415.818

15.02614.994

0.1400.090

14.88614.904

13.96213.980

18 1.5 6h4g

00.032

18.00017.968

0.2360.150

17.76417.818

17.02616.994

0.1400.090

16.88616.904

15.96215.980

20 1.5 6h4g

00.032

20.00019.968

0.2360.150

19.76419.818

19.02618.994

0.1400.090

18.88618.904

17.96217.980

22 1.5 6h4g

00.032

22.00021.968

0.2360.150

21.76421.818

21.02620.994

0.1400.090

20.88620.904

19.96219.980

24 2 6h4g

00.038

24.00023.962

0.2800.180

23.72023.782

22.70122.663

0.1700.106

22.53122.557

21.29921.325

27 2 6h4g

00.038

27.00026.962

0.2800.180

26.72026.782

25.70125.663

0.1700.106

25.53125.557

24.29924.325

30 2 6h4g

00.038

30.00029.962

0.2800.180

29.72029.782

28.70128.663

0.1700.106

28.53128.557

27.29927.325

33 2 6h4g

00.038

33.00032.962

0.2800.180

32.72032.782

31.70131.663

0.1700.106

31.53131.557

30.29930.325

36 2 6h4g

00.038

36.00035.962

0.2800.180

35.72035.782

34.70134.663

0.1700.106

34.53134.557

33.29933.325

39 2 6h4g

00.038

36.00038.962

0.2800.180

38.72038.782

37.70137.663

0.1700.106

37.53137.557

36.29936.325

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

BS 3643-2:1981

© BSI 12-1998

Publications referred to

BS 3382, Electroplated coatings on threaded components1). BS 3643, ISO metric screw threads. BS 3643-1, Principles and basic data1). PD 6494, Mismatch of screw thread systems. ISO/DIS 4042, Electroplated coatings on threaded components1).

1) Referred to in the foreword only.

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

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